From 8eb7269f27c9a8634c4c73f3be1664755740527a Mon Sep 17 00:00:00 2001
From: hreyes <hreyes@aduanasoft.com.mx>
Date: Fri, 24 Apr 2026 08:55:37 -0600
Subject: [PATCH 1/4] feature/bitacora-filtros-alineacion

---
 .../dashboard/audit_logs/bitacora-tab.svelte  | 22 +++++++++----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/frontend/src/routes/dashboard/audit_logs/bitacora-tab.svelte b/frontend/src/routes/dashboard/audit_logs/bitacora-tab.svelte
index 4b02f35a..407b76db 100644
--- a/frontend/src/routes/dashboard/audit_logs/bitacora-tab.svelte
+++ b/frontend/src/routes/dashboard/audit_logs/bitacora-tab.svelte
@@ -170,13 +170,13 @@
 <div class="flex min-h-0 flex-1 flex-col gap-4">
 	<Card.Root class="flex min-h-0 flex-1 flex-col overflow-hidden">
 		<Card.Header class="flex-none py-3">
-			<div class="flex items-center justify-between">
-				<div>
+			<div class="flex min-w-0 flex-col gap-2 md:flex-row md:items-center md:justify-between">
+				<div class="shrink-0">
 					<Card.Title>{text('Bitácora de Auditoría', 'Audit Log')}</Card.Title>
 					<Card.Description class="text-xs">{text(`Mostrando ${logs.length} de ${total} registros`, `Showing ${logs.length} of ${total} records`)}</Card.Description>
 				</div>
-				<div class="flex flex-wrap items-center gap-2">
-					<div class="relative">
+				<div class="flex w-full max-w-full min-w-0 items-center gap-2 overflow-x-auto overflow-y-hidden whitespace-nowrap pb-1 [scrollbar-gutter:stable] [scrollbar-width:thin] md:w-auto">
+					<div class="relative shrink-0">
 						<Search class="absolute top-2.5 left-2 h-4 w-4 text-muted-foreground" />
 						<Input
 							id="search"
@@ -189,7 +189,7 @@
 					<Input
 						id="username"
 						placeholder={text('Usuario', 'User')}
-						class="h-9 w-32"
+						class="h-9 w-32 shrink-0"
 						bind:value={usernameFilter}
 						oninput={handleSearchInput}
 					/>
@@ -197,7 +197,7 @@
 						id="procedure"
 						bind:value={procedureFilter}
 						onchange={handleFilterChange}
-						class="flex h-9 w-[180px] rounded-md border border-input bg-background px-3 py-1 text-sm shadow-sm ring-offset-background focus-visible:ring-2 focus-visible:ring-ring focus-visible:outline-none"
+						class="flex h-9 w-[180px] shrink-0 rounded-md border border-input bg-background px-3 py-1 text-sm shadow-sm ring-offset-background focus-visible:ring-2 focus-visible:ring-ring focus-visible:outline-none"
 						title={text('Procedimiento', 'Procedure')}
 					>
 						<option value="">{text('Procedimiento: Todos', 'Procedure: All')}</option>
@@ -208,27 +208,27 @@
 					<Input
 						id="dateFrom"
 						type="date"
-						class="h-9 w-36"
+						class="h-9 w-32 shrink-0"
 						bind:value={dateFrom}
 						onchange={handleFilterChange}
 						title={text('Desde', 'From')}
 					/>
-					<span class="text-sm text-muted-foreground">-</span>
+					<span class="shrink-0 text-sm text-muted-foreground">-</span>
 					<Input
 						id="dateTo"
 						type="date"
-						class="h-9 w-36"
+						class="h-9 w-32 shrink-0"
 						bind:value={dateTo}
 						onchange={handleFilterChange}
 						title={text('Hasta', 'To')}
 					/>
-					<Button variant="outline" size="sm" class="h-9" onclick={clearFilters}>
+					<Button variant="outline" size="sm" class="h-9 shrink-0" onclick={clearFilters}>
 						{text('Limpiar', 'Clear')}
 					</Button>
 					<Button
 						variant="outline"
 						size="sm"
-						class="h-9"
+						class="h-9 shrink-0"
 						onclick={() => {
 							page = 1;
 							hasMore = true;

From 38d10e6f5146e7420f58e6a04b25f53e79f6db66 Mon Sep 17 00:00:00 2001
From: hreyes <hreyes@aduanasoft.com.mx>
Date: Fri, 24 Apr 2026 09:18:41 -0600
Subject: [PATCH 2/4] feature/carril-expres-transportes

---
 ...d9e0f1a2b3_transporter_has_express_line.py | 49 +++++++++++++++++++
 .../a76/general_catalogs/company/dto.py       |  2 -
 .../a76/general_catalogs/company/models.py    |  1 -
 .../a76/general_catalogs/company/service.py   |  2 +-
 .../transmission/MAINX30/service.py           |  2 +-
 .../definitive/MAINX30/service.py             |  2 +-
 .../transmission/temporal/MAINX30/service.py  |  2 +-
 .../a76/transportation/transporters/dto.py    |  1 +
 .../a76/transportation/transporters/models.py |  3 +-
 .../transportation/transporters/services.py   |  1 +
 .../dashboard/a76/general_catalogs/company.ts |  2 -
 .../src/lib/api/dashboard/a76/transporters.ts |  1 +
 .../company/create-edit-dialog.svelte         |  9 +---
 .../transporters/create-edit-dialog.svelte    | 14 ++++--
 .../edit/[[id]]/+page.svelte                  | 14 ------
 15 files changed, 70 insertions(+), 35 deletions(-)
 create mode 100644 backend/alembic/versions/c8d9e0f1a2b3_transporter_has_express_line.py

diff --git a/backend/alembic/versions/c8d9e0f1a2b3_transporter_has_express_line.py b/backend/alembic/versions/c8d9e0f1a2b3_transporter_has_express_line.py
new file mode 100644
index 00000000..2d424d31
--- /dev/null
+++ b/backend/alembic/versions/c8d9e0f1a2b3_transporter_has_express_line.py
@@ -0,0 +1,49 @@
+"""Add has_express_line to transporter; remove from company.
+
+Revision ID: c8d9e0f1a2b3
+Revises: 6a7b8c9d0e1f
+Create Date: 2026-04-24
+
+Upgrade: add transporter column first (NOT NULL + default), then drop company column.
+Downgrade: restore company column, drop transporter column (schema only; data not restored).
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "c8d9e0f1a2b3"
+down_revision: Union[str, Sequence[str], None] = "6a7b8c9d0e1f"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+SCHEMA = "a76"
+
+
+def upgrade() -> None:
+    op.add_column(
+        "transporter",
+        sa.Column(
+            "has_express_line",
+            sa.Boolean(),
+            server_default=sa.text("false"),
+            nullable=False,
+        ),
+        schema=SCHEMA,
+    )
+    op.drop_column("company", "has_express_line", schema=SCHEMA)
+
+
+def downgrade() -> None:
+    op.add_column(
+        "company",
+        sa.Column(
+            "has_express_line",
+            sa.Boolean(),
+            server_default=sa.text("false"),
+            nullable=True,
+        ),
+        schema=SCHEMA,
+    )
+    op.drop_column("transporter", "has_express_line", schema=SCHEMA)
diff --git a/backend/api/v1/modules/a76/general_catalogs/company/dto.py b/backend/api/v1/modules/a76/general_catalogs/company/dto.py
index d9153034..97421872 100644
--- a/backend/api/v1/modules/a76/general_catalogs/company/dto.py
+++ b/backend/api/v1/modules/a76/general_catalogs/company/dto.py
@@ -58,7 +58,6 @@ class CompanyCreateDTO(BaseModel):
 
     # Configuration
     logo: Optional[str] = Field(None, max_length=512, description="Company logo (path local o clave S3)")
-    has_express_line: Optional[bool] = Field(None, description="Has express line")
     order_format_type: Optional[str] = Field(
         None, max_length=19, description="Order format type"
     )
@@ -293,7 +292,6 @@ class CompanyResponseDTO(BaseModel):
 
     # Configuration
     logo: Optional[str] = None
-    has_express_line: Optional[bool] = None
     fiscal_deposit: Optional[bool] = None
     generate_barcodes_with_fiel: Optional[bool] = None
     order_format_type: Optional[str] = None
diff --git a/backend/api/v1/modules/a76/general_catalogs/company/models.py b/backend/api/v1/modules/a76/general_catalogs/company/models.py
index ef914264..90c41010 100644
--- a/backend/api/v1/modules/a76/general_catalogs/company/models.py
+++ b/backend/api/v1/modules/a76/general_catalogs/company/models.py
@@ -61,7 +61,6 @@ class Company(Base, TimestampMixin):
 
     # Configuración básica
     logo: Mapped[Optional[str]] = mapped_column(String(512))
-    has_express_line: Mapped[Optional[bool]] = mapped_column(Boolean, default=False, server_default="false")
     fiscal_deposit: Mapped[Optional[bool]] = mapped_column(Boolean, default=False, server_default="false")
     generate_barcodes_with_fiel: Mapped[Optional[bool]] = mapped_column(Boolean, default=False, server_default="false")
     order_format_type: Mapped[Optional[str]] = mapped_column(String(19))
diff --git a/backend/api/v1/modules/a76/general_catalogs/company/service.py b/backend/api/v1/modules/a76/general_catalogs/company/service.py
index 1432a7be..962292d8 100644
--- a/backend/api/v1/modules/a76/general_catalogs/company/service.py
+++ b/backend/api/v1/modules/a76/general_catalogs/company/service.py
@@ -119,7 +119,7 @@ class CompanyService:
             "prosec", "prosec_authorization", "sector1", "sector2", "sector3",
             "manufacturer_id", "broker_company", "responsible", "responsible_name",
             "responsible_last_name", "responsible_mother_last_name", "responsible_rfc",
-            "position", "logo", "has_express_line", "fiscal_deposit",
+            "position", "logo", "fiscal_deposit",
             "generate_barcodes_with_fiel", "order_format_type",
             "is_service_company", "client_name", "subassembly_mode", "previous_code",
             "active_labels", "active_fractions", "activate_caat", "trans_interface",
diff --git a/backend/api/v1/modules/a76/reports/exportacion/transmission/MAINX30/service.py b/backend/api/v1/modules/a76/reports/exportacion/transmission/MAINX30/service.py
index ffe01710..e48363fe 100644
--- a/backend/api/v1/modules/a76/reports/exportacion/transmission/MAINX30/service.py
+++ b/backend/api/v1/modules/a76/reports/exportacion/transmission/MAINX30/service.py
@@ -277,7 +277,7 @@ class Mainx30Service:
             broker=(empresa.broker_company or "")[:5], 
             responsable=(empresa.responsible or "")[:30],
             rfc=(empresa.rfc or "")[:13],
-            tiene_linea_express=empresa.has_express_line or "N", 
+            tiene_linea_express="N",
             nombre_empresa=(empresa.name or "")[:40],
             manufacturer_id=(empresa.manufacturer_id or "")[:10],
             ftp_key=(empresa.ftp_key or "")[:10]
diff --git a/backend/api/v1/modules/a76/reports/importacion/transmission/definitive/MAINX30/service.py b/backend/api/v1/modules/a76/reports/importacion/transmission/definitive/MAINX30/service.py
index 634058ee..881406b3 100644
--- a/backend/api/v1/modules/a76/reports/importacion/transmission/definitive/MAINX30/service.py
+++ b/backend/api/v1/modules/a76/reports/importacion/transmission/definitive/MAINX30/service.py
@@ -166,7 +166,7 @@ class Mainx30DefinitiveService:
             broker=(empresa.broker_company or "")[:5], 
             responsable=(empresa.responsible or "")[:30],
             rfc=(empresa.rfc or "")[:13],
-            tiene_linea_express=empresa.has_express_line or "N", 
+            tiene_linea_express="N",
             nombre_empresa=(empresa.name or "")[:40],
             manufacturer_id=(empresa.manufacturer_id or "")[:10],
             ftp_key=(empresa.ftp_key or "")[:10],
diff --git a/backend/api/v1/modules/a76/reports/importacion/transmission/temporal/MAINX30/service.py b/backend/api/v1/modules/a76/reports/importacion/transmission/temporal/MAINX30/service.py
index 78dadbc6..276182bd 100644
--- a/backend/api/v1/modules/a76/reports/importacion/transmission/temporal/MAINX30/service.py
+++ b/backend/api/v1/modules/a76/reports/importacion/transmission/temporal/MAINX30/service.py
@@ -168,7 +168,7 @@ class Mainx30Service:
             broker=(empresa.broker_company or "")[:5], 
             responsable=(empresa.responsible or "")[:30],
             rfc=(empresa.rfc or "")[:13],
-            tiene_linea_express=empresa.has_express_line or "N", 
+            tiene_linea_express="N",
             nombre_empresa=(empresa.name or "")[:40],
             manufacturer_id=(empresa.manufacturer_id or "")[:10],
             ftp_key=(empresa.ftp_key or "")[:10],
diff --git a/backend/api/v1/modules/a76/transportation/transporters/dto.py b/backend/api/v1/modules/a76/transportation/transporters/dto.py
index c4397d00..969fed6e 100644
--- a/backend/api/v1/modules/a76/transportation/transporters/dto.py
+++ b/backend/api/v1/modules/a76/transportation/transporters/dto.py
@@ -24,6 +24,7 @@ class TransporterBaseDTO(BaseModel):
     ftp_password: Optional[str] = None
     ftp_directory: Optional[str] = None
     filler_code: Optional[str] = None
+    has_express_line: Optional[bool] = False
 
 
 class TransporterCreateDTO(TransporterBaseDTO):
diff --git a/backend/api/v1/modules/a76/transportation/transporters/models.py b/backend/api/v1/modules/a76/transportation/transporters/models.py
index 58d03367..ec50d643 100644
--- a/backend/api/v1/modules/a76/transportation/transporters/models.py
+++ b/backend/api/v1/modules/a76/transportation/transporters/models.py
@@ -1,6 +1,6 @@
 from api.v1.common.base_models import TenantScopedMixin, TimestampMixin
 from core.database import Base
-from sqlalchemy import BigInteger, Column, ForeignKeyConstraint, String
+from sqlalchemy import BigInteger, Boolean, Column, ForeignKeyConstraint, String
 
 
 class Transporter(Base, TenantScopedMixin, TimestampMixin):
@@ -30,3 +30,4 @@ class Transporter(Base, TenantScopedMixin, TimestampMixin):
     ftp_password = Column(String(100), nullable=True)
     ftp_directory = Column(String(1000), nullable=True)
     filler_code = Column(String(20), nullable=True)
+    has_express_line = Column(Boolean, nullable=False, server_default="false")
diff --git a/backend/api/v1/modules/a76/transportation/transporters/services.py b/backend/api/v1/modules/a76/transportation/transporters/services.py
index 2654677e..8f40888d 100644
--- a/backend/api/v1/modules/a76/transportation/transporters/services.py
+++ b/backend/api/v1/modules/a76/transportation/transporters/services.py
@@ -159,6 +159,7 @@ class TransporterService:
             "ftp_password": transporter.ftp_password,
             "ftp_directory": transporter.ftp_directory,
             "filler_code": transporter.filler_code,
+            "has_express_line": transporter.has_express_line,
         }
         merged.update(update_data)
         validate_transporter_row_for_api(
diff --git a/frontend/src/lib/api/dashboard/a76/general_catalogs/company.ts b/frontend/src/lib/api/dashboard/a76/general_catalogs/company.ts
index 73228d75..7934463e 100644
--- a/frontend/src/lib/api/dashboard/a76/general_catalogs/company.ts
+++ b/frontend/src/lib/api/dashboard/a76/general_catalogs/company.ts
@@ -107,7 +107,6 @@ export interface Company {
     responsible_mother_last_name: string | null;
     responsible_rfc?: string | null;
     position?: string | null;
-    has_express_line?: boolean;
     fiscal_deposit?: boolean;
     generate_barcodes_with_fiel?: boolean;
     is_service_company?: boolean;
@@ -273,7 +272,6 @@ export interface CompanyCreate {
     responsible_mother_last_name?: string | null;
     responsible_rfc?: string | null;
     position?: string | null;
-    has_express_line?: boolean;
     fiscal_deposit?: boolean;
     generate_barcodes_with_fiel?: boolean;
     is_service_company?: boolean;
diff --git a/frontend/src/lib/api/dashboard/a76/transporters.ts b/frontend/src/lib/api/dashboard/a76/transporters.ts
index da855ae0..0ff1084f 100644
--- a/frontend/src/lib/api/dashboard/a76/transporters.ts
+++ b/frontend/src/lib/api/dashboard/a76/transporters.ts
@@ -21,6 +21,7 @@ export interface Transporter {
     ftp_password?: string;
     ftp_directory?: string;
     filler_code?: string;
+    has_express_line?: boolean;
     company_id?: number | string;
     tenant_id?: number | string;
 }
diff --git a/frontend/src/lib/components/dashboard/general_catalogs/company/create-edit-dialog.svelte b/frontend/src/lib/components/dashboard/general_catalogs/company/create-edit-dialog.svelte
index 2cc43f4a..8a37a99c 100644
--- a/frontend/src/lib/components/dashboard/general_catalogs/company/create-edit-dialog.svelte
+++ b/frontend/src/lib/components/dashboard/general_catalogs/company/create-edit-dialog.svelte
@@ -43,7 +43,6 @@
         
         // Configuración / Operativo
         manufacturer_id: '',
-        has_express_line: false,
         is_service_company: false,
         order_format_type: '',
         
@@ -76,7 +75,6 @@
                 position: item.position || '',
                 
                 manufacturer_id: item.manufacturer_id || '',
-                has_express_line: item.has_express_line || false,
                 is_service_company: item.is_service_company || false,
                 order_format_type: item.order_format_type || '',
                 
@@ -89,7 +87,7 @@
                 name: '', rfc: '', curp: '', main_activity: '',
                 program: '', program_number: '', prosec: 0, prosec_authorization: '',
                 responsible_name: '', responsible_last_name: '', responsible_mother_last_name: '', responsible_rfc: '', position: '',
-                manufacturer_id: '', has_express_line: false, is_service_company: false, order_format_type: '',
+                manufacturer_id: '', is_service_company: false, order_format_type: '',
                 ctpat_svi: '', trusted_exporter_number: ''
             };
         }
@@ -124,7 +122,6 @@
                 position: formData.position.trim() || null,
                 
                 manufacturer_id: formData.manufacturer_id.trim() || null,
-                has_express_line: formData.has_express_line,
                 is_service_company: formData.is_service_company,
                 order_format_type: formData.order_format_type.trim() || null,
                 
@@ -249,10 +246,6 @@
 
                 <Tabs.Content value="config" class="space-y-4 py-4">
                     <div class="grid grid-cols-2 gap-6">
-                        <div class="flex items-center space-x-2">
-                            <Switch id="express" bind:checked={formData.has_express_line} />
-                            <Label for="express">Carril Exprés (OEA/NEEC)</Label>
-                        </div>
                         <div class="flex items-center space-x-2">
                             <Switch id="service" bind:checked={formData.is_service_company} />
                             <Label for="service">Es Empresa de Servicios</Label>
diff --git a/frontend/src/lib/components/dashboard/transportation/transporters/create-edit-dialog.svelte b/frontend/src/lib/components/dashboard/transportation/transporters/create-edit-dialog.svelte
index 81d953b1..6d05d2ba 100644
--- a/frontend/src/lib/components/dashboard/transportation/transporters/create-edit-dialog.svelte
+++ b/frontend/src/lib/components/dashboard/transportation/transporters/create-edit-dialog.svelte
@@ -3,6 +3,7 @@
 	import * as Dialog from '$lib/components/ui/dialog';
 	import { Input } from '$lib/components/ui/input';
 	import { Label } from '$lib/components/ui/label';
+	import { Switch } from '$lib/components/ui/switch';
 	import * as Select from '$lib/components/ui/select';
 	import { transportersApi, type Transporter } from '$lib/api/dashboard/a76/transporters';
 	import { countriesApi, type Country } from '$lib/api/dashboard/reference_data/countries';
@@ -45,7 +46,8 @@
 		ftp_user: '',
 		ftp_password: '',
 		ftp_directory: '',
-		filler_code: ''
+		filler_code: '',
+		has_express_line: false
 	});
 
 	let loading = $state(false);
@@ -99,7 +101,8 @@
 			ftp_user: '',
 			ftp_password: '',
 			ftp_directory: '',
-			filler_code: ''
+			filler_code: '',
+			has_express_line: false
 		};
 	}
 
@@ -110,7 +113,7 @@
 			return;
 		}
 		if (item) {
-			formData = { ...item };
+			formData = { ...item, has_express_line: item.has_express_line ?? false };
 		} else {
 			formData = emptyTransporterForm();
 		}
@@ -284,6 +287,11 @@
 						<Label for="filler_code">Código Relleno</Label>
 						<Input id="filler_code" bind:value={formData.filler_code} maxlength={20} />
 					</div>
+
+					<div class="flex items-center justify-between gap-3 rounded-lg border p-4">
+						<Label for="has_express_line" class="text-sm font-medium">Carril express</Label>
+						<Switch id="has_express_line" bind:checked={formData.has_express_line} />
+					</div>
 				</section>
 
 				<!-- Dirección -->
diff --git a/frontend/src/routes/dashboard/general_catalogs/company_information/edit/[[id]]/+page.svelte b/frontend/src/routes/dashboard/general_catalogs/company_information/edit/[[id]]/+page.svelte
index 50a17ed4..5324812d 100644
--- a/frontend/src/routes/dashboard/general_catalogs/company_information/edit/[[id]]/+page.svelte
+++ b/frontend/src/routes/dashboard/general_catalogs/company_information/edit/[[id]]/+page.svelte
@@ -86,7 +86,6 @@
 		responsible_rfc: '',
 		position: '',
 		manufacturer_id: '',
-		has_express_line: false,
 		fiscal_deposit: false,
 		generate_barcodes_with_fiel: false,
 		is_service_company: false,
@@ -258,7 +257,6 @@
 					responsible_rfc: item.responsible_rfc || '',
 					position: item.position || '',
 					manufacturer_id: item.manufacturer_id || '',
-					has_express_line: item.has_express_line || false,
 					fiscal_deposit: item.fiscal_deposit || false,
 					generate_barcodes_with_fiel: item.generate_barcodes_with_fiel || false,
 					is_service_company: item.is_service_company || false,
@@ -694,7 +692,6 @@
 				cancel_cer_exp: Number(formData.cancel_cer_exp) || 0,
 				cancel_key_exp: Number(formData.cancel_key_exp) || 0,
 				// Ensure optional booleans are passed correctly or default to false/null if needed
-				has_express_line: formData.has_express_line,
 				fiscal_deposit: formData.fiscal_deposit,
 				generate_barcodes_with_fiel: formData.generate_barcodes_with_fiel,
 				is_service_company: formData.is_service_company
@@ -937,17 +934,6 @@
 										/>
 									</div>
 								</div>
-								<div class="grid grid-cols-1 items-start gap-4">
-									<div class="grid gap-3 rounded-lg border p-4">
-										<label for="has_express_line" class="flex items-center justify-between gap-3">
-											<span class="text-sm font-medium">Tiene Linea Express</span>
-											<Switch
-												id="has_express_line"
-												bind:checked={formData.has_express_line}
-											/>
-										</label>
-									</div>
-								</div>
 							</div>
 
 							<div class="grid gap-4 rounded-lg border bg-muted/30 p-4">

From bbe0b5c02480ccb87c34d9cd29752196755f3e6c Mon Sep 17 00:00:00 2001
From: hreyes <hreyes@aduanasoft.com.mx>
Date: Fri, 24 Apr 2026 09:30:35 -0600
Subject: [PATCH 3/4] feature/sidebar-empresa-refresh

---
 .../general_catalogs/company/create-edit-dialog.svelte     | 2 ++
 frontend/src/routes/dashboard/+layout.svelte               | 7 +++++--
 .../general_catalogs/company_information/+page.svelte      | 2 ++
 .../company_information/edit/[[id]]/+page.svelte           | 1 +
 4 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/frontend/src/lib/components/dashboard/general_catalogs/company/create-edit-dialog.svelte b/frontend/src/lib/components/dashboard/general_catalogs/company/create-edit-dialog.svelte
index 8a37a99c..933f4680 100644
--- a/frontend/src/lib/components/dashboard/general_catalogs/company/create-edit-dialog.svelte
+++ b/frontend/src/lib/components/dashboard/general_catalogs/company/create-edit-dialog.svelte
@@ -6,6 +6,7 @@
     import * as Tabs from "$lib/components/ui/tabs";
     import { Switch } from "$lib/components/ui/switch"; 
     import { createCompany, updateCompany, type Company } from "$lib/api/dashboard/a76/general_catalogs/company";
+    import { companyStore } from "$lib/stores/company.svelte";
 
     let {
         open = $bindable(false),
@@ -140,6 +141,7 @@
                 throw new Error(response.error);
             }
 
+            await companyStore.loadCompanies();
             open = false;
             if (onSuccess) onSuccess();
         } catch (e) {
diff --git a/frontend/src/routes/dashboard/+layout.svelte b/frontend/src/routes/dashboard/+layout.svelte
index 2e7cbafe..2da2dfd1 100644
--- a/frontend/src/routes/dashboard/+layout.svelte
+++ b/frontend/src/routes/dashboard/+layout.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
 	import { setContext, onMount, onDestroy } from 'svelte';
-	import { invalidateAll } from '$app/navigation';
+	import { invalidateAll, goto } from '$app/navigation';
 	import type { LayoutData } from './$types';
 	import AppSidebar from '$lib/components/sidebar/app-sidebar.svelte';
 	import * as Breadcrumb from '$lib/components/ui/breadcrumb/index.js';
@@ -100,7 +100,10 @@
 		}
 
 		// ── Escuchar cambios de compañía y recargar datos ─────────────────────
-		const handleCompanyChange = () => invalidateAll();
+		const handleCompanyChange = async () => {
+			await invalidateAll();
+			await goto(`${page.url.pathname}${page.url.search}${page.url.hash}`, { invalidateAll: true });
+		};
 		window.addEventListener('companyChanged', handleCompanyChange);
 		window.addEventListener(CSV_IMPORT_SESSION_CHANGED, updateCsvImportBanner);
 		updateCsvImportBanner();
diff --git a/frontend/src/routes/dashboard/general_catalogs/company_information/+page.svelte b/frontend/src/routes/dashboard/general_catalogs/company_information/+page.svelte
index f25fa8a2..2556b4f9 100644
--- a/frontend/src/routes/dashboard/general_catalogs/company_information/+page.svelte
+++ b/frontend/src/routes/dashboard/general_catalogs/company_information/+page.svelte
@@ -14,6 +14,7 @@
 	import { useShortcuts } from '$lib/hooks/use-shortcuts';
 	import { obtenerAtajosListaEmpresa } from '$lib/config/shortcuts/dashboard/general_catalogs/company_information/list';
 	import { getCompanies, deleteCompany, type Company } from '$lib/api/dashboard/a76/general_catalogs/company';
+	import { companyStore } from '$lib/stores/company.svelte';
 
 	let { data } = $props();
 	let selectedIds = $state<(string | number)[]>([]);
@@ -162,6 +163,7 @@
 
 			selectedIds = [];
 			await reloadData();
+			await companyStore.loadCompanies();
 		} catch (err) {
 			error = 'Error al eliminar la empresa';
 			console.error('Error deleting company:', err);
diff --git a/frontend/src/routes/dashboard/general_catalogs/company_information/edit/[[id]]/+page.svelte b/frontend/src/routes/dashboard/general_catalogs/company_information/edit/[[id]]/+page.svelte
index 5324812d..b2faeef1 100644
--- a/frontend/src/routes/dashboard/general_catalogs/company_information/edit/[[id]]/+page.svelte
+++ b/frontend/src/routes/dashboard/general_catalogs/company_information/edit/[[id]]/+page.svelte
@@ -708,6 +708,7 @@
 				await uploadLogo(response.data.id);
 			}
 
+			await companyStore.loadCompanies();
 			goto('/dashboard/general_catalogs/company_information');
 		} catch (e: any) {
 			error = e.message || 'Error al guardar';

From 3c40a48cb7c9144ff775a473272695920df78b83 Mon Sep 17 00:00:00 2001
From: hreyes <hreyes@aduanasoft.com.mx>
Date: Fri, 24 Apr 2026 09:58:22 -0600
Subject: [PATCH 4/4] feature/api-sitar-frac-ame

---
 .../fractions/tariff_fractions/routes.py      | 112 +++---------
 .../fractions/tariff_fractions/service.py     | 106 ++++++------
 .../fractions/us_tariff_fractions/routes.py   | 159 ++++++++++++++----
 .../a76/items/exports/validators/common.py    |  52 +-----
 .../a76/items/exports/validators/create.py    |  30 ++--
 .../a76/items/exports/validators/update.py    |  29 ++--
 .../a76/items/imports/validators/common.py    |  73 +-------
 .../a76/items/imports/validators/create.py    |  30 ++--
 .../a76/items/imports/validators/update.py    |  29 ++--
 .../layouts_csv/classes/common/fk_loader.py   |  25 +--
 .../layouts_csv/classes/validators/common.py  |  15 +-
 .../line_item_enrichment/import_enrichment.py |  27 ++-
 .../modules/a76/layouts_csv/facturas/tasks.py |  24 +--
 .../facturas/validators/partidas_expo.py      |  12 +-
 .../facturas/validators/partidas_impo_temp.py |  13 +-
 .../us_tariff_fractions/common/fk_loader.py   |  15 +-
 .../us_tariff_fractions/validators/common.py  |   6 +-
 .../importacion/consolidados/mex/service.py   |  25 ++-
 .../consolidados/temporary/mex/service.py     |  27 ++-
 .../v1/modules/sitar/common/base_service.py   |  44 +++++
 .../sitar/fracciones_usa/catalog_resolve.py   | 124 ++++++++++++++
 .../modules/sitar/fracciones_usa/service.py   |  38 ++++-
 frontend/e2e/setup-catalogs.spec.ts           |   3 +-
 frontend/src/lib/api.ts                       |  18 --
 .../general_catalogs/us-tariff-fractions.ts   |  63 +------
 .../csv-upload/CsvPendingImportsSheet.svelte  |   1 -
 .../csv-upload/ProcessingResultModal.svelte   |   4 -
 .../classes/forms/FixedAssetClassForm.svelte  |  33 ++--
 .../us-fraction-selector-dialog.svelte        |  21 ++-
 .../edit/items/fa/packages-section.svelte     |   8 +-
 .../src/lib/components/sidebar/modules.ts     |   4 -
 frontend/src/lib/config/csv-upload.ts         |   9 -
 frontend/src/lib/csv-import-pending.ts        |   1 -
 frontend/src/lib/csv-import-session.ts        |   2 -
 frontend/src/lib/csv-import-status-api.ts     |   2 -
 .../routes/dashboard/csv-upload/+page.svelte  |  36 +---
 .../tariff-fractions/american/+page.svelte    |   6 -
 .../tariff-fractions/american/+page.ts        |   7 +
 38 files changed, 597 insertions(+), 636 deletions(-)
 create mode 100644 backend/api/v1/modules/sitar/fracciones_usa/catalog_resolve.py
 delete mode 100644 frontend/src/routes/dashboard/general_catalogs/tariff-fractions/american/+page.svelte
 create mode 100644 frontend/src/routes/dashboard/general_catalogs/tariff-fractions/american/+page.ts

diff --git a/backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/routes.py b/backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/routes.py
index 21277c99..f46df469 100644
--- a/backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/routes.py
+++ b/backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/routes.py
@@ -4,7 +4,7 @@ Catálogo de referencia global (no tenant-scoped)
 """
 
 from typing import Any, Dict, Optional
-from fastapi import APIRouter, Depends, Query
+from fastapi import APIRouter, Depends, HTTPException, Query, status
 from sqlalchemy.orm import Session
 
 from core.database import get_core_db
@@ -32,7 +32,10 @@ async def list_tariff_fractions(
     page_size: int = Query(50, ge=1, le=10000, description="Page size"),
     search: Optional[str] = Query(None, description="Search in code, fraction, description, nico, or umt"),
     level: Optional[int] = Query(None, description="Filter by hierarchy level (e.g. 5)"),
-    catalog: Optional[str] = Query("mex", description="Catalog source: 'mex' (default) or 'usa'"),
+    catalog: Optional[str] = Query(
+        "mex",
+        description="Catalog: 'mex' (default), 'usa', or 'american' (both US read-only via SITAR)",
+    ),
     db: Session = Depends(get_core_db),
     current_user: Dict[str, Any] = Depends(get_current_user),
 ):
@@ -88,7 +91,7 @@ async def get_tariff_fraction(
     "/",
     response_model=TariffFractionResponseDTO,
     summary="Create Tariff Fraction",
-    description="Create a new tariff fraction (Only supported for 'american' catalog)",
+    description="Not supported: all catalogs are read-only (SITAR-backed for US).",
 )
 async def create_tariff_fraction(
     fraction_data: TariffFractionCreateDTO,
@@ -97,101 +100,36 @@ async def create_tariff_fraction(
     db: Session = Depends(get_core_db),
     current_user: Dict[str, Any] = Depends(get_current_user),
 ):
-    """
-    Crea una nueva fracción.
-    - MEX/USA: No permitido (Read-Only)
-    - AMERICAN: Permitido (Local DB)
-    """
-    from fastapi import HTTPException
-    
-    tenant_id = current_user.get("tenant_id")
-    
-    if catalog == "american":
-        from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.service import USTariffFractionService
-        from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.dto import USTariffFractionCreateDTO
-        import re
-
-        # Map generic DTO to US DTO
-        ad_valorem = None
-        if fraction_data.adv_impo:
-            try:
-                # remove non-numeric chars except dot
-                clean = re.sub(r'[^\d.]', '', fraction_data.adv_impo)
-                if clean:
-                    ad_valorem = float(clean)
-            except:
-                pass
-        
-        us_dto = USTariffFractionCreateDTO(
-            code=fraction_data.fraction, # Store the punctuated fraction in the DB
-            description=fraction_data.description,
-            unit_of_measure=fraction_data.umt,
-            ad_valorem=ad_valorem,
-            # Defaults for others
-            prefix=None,
-            type_code=None,
-            fixed_cost=None
-        )
-        
-        created = USTariffFractionService.create(db, us_dto, tenant_id, company_id)
-        return TariffFractionService.to_domain_usa_local(created)
-    
-    else:
-        raise HTTPException(status_code=400, detail=f"Creation not allowed for '{catalog}' catalog (Read-Only)")
+    raise HTTPException(
+        status_code=status.HTTP_405_METHOD_NOT_ALLOWED,
+        detail=f"Creation not allowed for '{catalog}' catalog (read-only; US data from SITAR).",
+    )
 
 
 @router.put(
     "/{tariff_fraction_id}",
     response_model=TariffFractionResponseDTO,
     summary="Update Tariff Fraction",
-    description="Update a tariff fraction (Only supported for 'american' catalog)",
+    description="Not supported: all catalogs are read-only (SITAR-backed for US).",
 )
 async def update_tariff_fraction(
     tariff_fraction_id: int,
     fraction_data: TariffFractionUpdateDTO,
-    catalog: str = Query("mex", description="Catalog source: 'mex', 'usa', or 'american'"), 
+    catalog: str = Query("mex", description="Catalog source: 'mex', 'usa', or 'american'"),
     company_id: int = Query(..., description="Company ID"),
     db: Session = Depends(get_core_db),
     current_user: Dict[str, Any] = Depends(get_current_user),
 ):
-    from fastapi import HTTPException
-    
-    tenant_id = current_user.get("tenant_id")
-    
-    if catalog == "american":
-        from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.service import USTariffFractionService
-        from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.dto import USTariffFractionUpdateDTO
-        import re
-
-        ad_valorem = None
-        if fraction_data.adv_impo:
-            try:
-                clean = re.sub(r'[^\d.]', '', fraction_data.adv_impo)
-                if clean:
-                    ad_valorem = float(clean)
-            except:
-                pass
-        
-        us_dto = USTariffFractionUpdateDTO(
-            code=fraction_data.fraction,
-            description=fraction_data.description,
-            unit_of_measure=fraction_data.umt,
-            ad_valorem=ad_valorem
-        )
-        
-        updated = USTariffFractionService.update(db, tariff_fraction_id, tenant_id, us_dto, company_id)
-        if not updated:
-             raise HTTPException(status_code=404, detail="US Tariff fraction not found")
-        return TariffFractionService.to_domain_usa_local(updated)
-
-    else:
-         raise HTTPException(status_code=400, detail=f"Update not allowed for '{catalog}' catalog (Read-Only)")
+    raise HTTPException(
+        status_code=status.HTTP_405_METHOD_NOT_ALLOWED,
+        detail=f"Update not allowed for '{catalog}' catalog (read-only; US data from SITAR).",
+    )
 
 
 @router.delete(
     "/{tariff_fraction_id}",
     summary="Delete Tariff Fraction",
-    description="Delete a tariff fraction (Only supported for 'american' catalog)",
+    description="Not supported: all catalogs are read-only (SITAR-backed for US).",
 )
 async def delete_tariff_fraction(
     tariff_fraction_id: int,
@@ -200,16 +138,8 @@ async def delete_tariff_fraction(
     db: Session = Depends(get_core_db),
     current_user: Dict[str, Any] = Depends(get_current_user),
 ):
-    from fastapi import HTTPException
-    tenant_id = current_user.get("tenant_id")
-    
-    if catalog == "american":
-        from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.service import USTariffFractionService
-        success = USTariffFractionService.delete(db, tariff_fraction_id, tenant_id, company_id)
-        if not success:
-             raise HTTPException(status_code=404, detail="US Tariff fraction not found")
-        return {"ok": True}
-    
-    else:
-        raise HTTPException(status_code=400, detail=f"Delete not allowed for '{catalog}' catalog (Read-Only)")
+    raise HTTPException(
+        status_code=status.HTTP_405_METHOD_NOT_ALLOWED,
+        detail=f"Delete not allowed for '{catalog}' catalog (read-only; US data from SITAR).",
+    )
 
diff --git a/backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/service.py b/backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/service.py
index 380cf508..a54f8cf7 100644
--- a/backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/service.py
+++ b/backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/service.py
@@ -111,6 +111,49 @@ class TariffFractionService:
             adv_expo=None
         )
 
+    @staticmethod
+    async def _fetch_usa_catalog_from_sitar(
+        skip: int,
+        limit: int,
+        filters: Optional[Dict[str, Any]],
+    ) -> Tuple[List[TariffFraction], int]:
+        """SITAR fracciones-usa for catalog 'usa' and 'american' (read-only, same source)."""
+        try:
+            usa_service = FraccionesUSAService.get_instance()
+        except ValueError:
+            logger.warning("SITAR USA not configured (missing env)")
+            return [], 0
+
+        search_term = None
+        search_description = None
+
+        if filters and filters.get("search"):
+            term = filters["search"]
+            clean_term = term.replace(".", "")
+            if clean_term.isdigit() and len(clean_term) >= 4:
+                search_term = term
+            else:
+                search_description = term
+
+        try:
+            usa_items = await usa_service.search(
+                fraccion=search_term,
+                descripcion=search_description,
+                skip=skip,
+                limit=limit,
+            )
+            items = [TariffFractionMapper.to_domain_usa(item) for item in usa_items]
+            total = len(items) + skip
+            if len(items) == limit:
+                total += 1
+            return items, total
+        except Exception as e:
+            import traceback
+
+            logger.error("Error fetching USA fractions from SITAR: %s", e)
+            logger.error(traceback.format_exc())
+            return [], 0
+
     @staticmethod
     async def get_all(
         db: Session,
@@ -123,64 +166,15 @@ class TariffFractionService:
     ) -> Tuple[List[TariffFraction], int]:
         """
         Obtiene fracciones arancelarias.
-        Estrategia: 
-        - MEX: Sitar API -> Fallback Local DB
-        - USA: Local DB (Defined by user requirement)
+        Estrategia:
+        - MEX: Sitar API (fracciones)
+        - USA / AMERICAN: Sitar API (fracciones-usa), solo lectura
         """
-        
-        # AMERICAN CATALOG HANDLING (LOCAL - 'Fracciones Americanas')
-        if catalog == "american":
-            if tenant_id is None or company_id is None:
-                logger.warning("Solicitud de fracciones Americanas sin tenant/company ID")
-                return [], 0
-                
-            from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.service import USTariffFractionService
-            
-            # Use local service directly
-            usa_items, total = await USTariffFractionService.get_all(
-                db, tenant_id, company_id, skip, limit, filters
+
+        if catalog in ("american", "usa"):
+            return await TariffFractionService._fetch_usa_catalog_from_sitar(
+                skip, limit, filters
             )
-            
-            items = [TariffFractionService.to_domain_usa_local(item) for item in usa_items]
-            return items, total
-
-        # USA CATALOG HANDLING (API - 'Fracciones US')
-        if catalog == "usa":
-            try:
-                usa_service = FraccionesUSAService.get_instance()
-                search_term = None
-                search_description = None
-
-                if filters and filters.get("search"):
-                     term = filters["search"]
-                     # Simple heuristic: if it looks like a code, use code search, else description
-                     # FIX: Short numeric codes (e.g. "01") often fail strict 'fraccion' search. 
-                     # Treat them as description search for partial matching.
-                     clean_term = term.replace(".", "")
-                     if clean_term.isdigit() and len(clean_term) >= 4:
-                        search_term = term
-                     else:
-                        search_description = term
-                
-                # USA Service search signature: fraccion, descripcion, skip, limit
-                usa_items = await usa_service.search(
-                    fraccion=search_term,
-                    descripcion=search_description,
-                    skip=skip,
-                    limit=limit
-                )
-                
-                items = [TariffFractionMapper.to_domain_usa(item) for item in usa_items]
-                total = len(items) + skip
-                if len(items) == limit:
-                     total += 1
-                return items, total
-            except Exception as e:
-                import traceback
-                logger.error(f"Error fetching USA fractions (API): {e}")
-                logger.error(traceback.format_exc())
-                # Return empty list on error as per requirement (since API is broken)
-                return [], 0
 
         # MEX (SITAR) CATALOG HANDLING
         try:
diff --git a/backend/api/v1/modules/a76/general_catalogs/fractions/us_tariff_fractions/routes.py b/backend/api/v1/modules/a76/general_catalogs/fractions/us_tariff_fractions/routes.py
index d228d085..5bb5cb44 100644
--- a/backend/api/v1/modules/a76/general_catalogs/fractions/us_tariff_fractions/routes.py
+++ b/backend/api/v1/modules/a76/general_catalogs/fractions/us_tariff_fractions/routes.py
@@ -1,70 +1,131 @@
 """
-Endpoints API para fracciones arancelarias americanas
+Endpoints API para fracciones arancelarias americanas (solo lectura; fuente SITAR).
 """
 
+from datetime import datetime, timezone
 from typing import Any, Dict, Optional
-from fastapi import APIRouter, Depends, Query
+
+from fastapi import APIRouter, Depends, HTTPException, Query, status
 from sqlalchemy.orm import Session
 
 from core.database import get_core_db
-from core.security import get_current_user
-from api.v1.common.tenant_crud_routes import TenantCRUDRoutes, validate_access_to_resource
+from core.security import get_current_user, validate_access_to_resource
 
-from .dto import (
-    USTariffFractionCreateDTO,
-    USTariffFractionResponseDTO,
-    USTariffFractionUpdateDTO,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    american_fraction_ad_valorem_from_row,
+    canonical_code_from_sitar_row,
 )
-from .service import USTariffFractionService
+from api.v1.modules.sitar.fracciones_usa.schemas import FraccionesUSAResponse
+from api.v1.modules.sitar.fracciones_usa.service import FraccionesUSAService
 
-# Create router using TenantCRUDRoutes factory for basic CRUD operations (prefix="" so we mount under main_router)
-crud_router = TenantCRUDRoutes(
-    service=USTariffFractionService,
-    create_schema=USTariffFractionCreateDTO,
-    update_schema=USTariffFractionUpdateDTO,
-    response_schema=USTariffFractionResponseDTO,
-    prefix="",
+from .dto import USTariffFractionResponseDTO
+
+
+def _sitar_row_to_us_response_payload(item: FraccionesUSAResponse) -> dict:
+    """Build payload for USTariffFractionResponseDTO.model_validate (SITAR row)."""
+    canon = canonical_code_from_sitar_row(item)
+    now = datetime.now(timezone.utc)
+    return {
+        "id": item.CONSECUTIVO,
+        "code": canon,
+        "prefix": item.FRACCION_SIN_PUNTO,
+        "type_code": str(item.NIVEL) if item.NIVEL is not None else None,
+        "ad_valorem": american_fraction_ad_valorem_from_row(item),
+        "fixed_cost": None,
+        "unit_of_measure": item.UNIDADCANTIDAD,
+        "description": item.DESCRIPCION,
+        "created_at": now,
+        "updated_at": now,
+    }
+
+
+main_router = APIRouter(
+    prefix="/us-tariff-fractions",
     tags=["a76 / general catalogs / us tariff fractions"],
-    resource_name="US Tariff Fraction",
-    id_name="id",
-    enable_list=False, # We implement our custom list endpoint
 )
 
-# Master router with prefix so all routes live under /us-tariff-fractions
-from api.v1.modules.a76.layouts_csv.us_tariff_fractions.routes import router as imports_router
-main_router = APIRouter(prefix="/us-tariff-fractions", tags=["a76 / general catalogs / us tariff fractions"])
-main_router.include_router(imports_router, prefix="/imports", tags=["us_tariff_fractions / csv_import"])
-main_router.include_router(crud_router.router)
+
+@main_router.api_route(
+    "/imports",
+    methods=["GET", "POST", "PUT", "PATCH", "DELETE", "HEAD", "OPTIONS"],
+    include_in_schema=False,
+)
+@main_router.api_route(
+    "/imports/{path:path}",
+    methods=["GET", "POST", "PUT", "PATCH", "DELETE", "HEAD", "OPTIONS"],
+    include_in_schema=False,
+)
+async def us_tariff_imports_disabled(path: str = ""):
+    raise HTTPException(
+        status_code=status.HTTP_410_GONE,
+        detail="CSV import for US tariff fractions is disabled; catalog is read-only from SITAR.",
+    )
 
 
-# Custom list endpoint with search filter (under /us-tariff-fractions/)
 @main_router.get(
     "/",
     response_model=Dict[str, Any],
     summary="List US Tariff Fractions",
-    description="Get paginated list of US Tariff Fractions with optional search filter",
+    description="Paginated list from SITAR fracciones-usa (read-only).",
 )
 async def list_us_tariff_fractions(
     company_id: int = Query(..., description="Company ID"),
     page: int = Query(1, ge=1, description="Page number"),
     page_size: int = Query(50, ge=1, le=10000, description="Page size"),
-    search: Optional[str] = Query(None, description="Search in code, description, or prefix"),
+    search: Optional[str] = Query(None, description="Search in code or description"),
     db: Session = Depends(get_core_db),
     current_user: Dict[str, Any] = Depends(get_current_user),
 ):
-    tenant_id = validate_access_to_resource(db, company_id, current_user)
-    
+    validate_access_to_resource(db, company_id, current_user)
+
     skip = (page - 1) * page_size
-    filters = {}
+    try:
+        svc = FraccionesUSAService.get_instance()
+    except ValueError:
+        return {
+            "items": [],
+            "total": 0,
+            "page": page,
+            "page_size": page_size,
+            "pages": 0,
+        }
+
+    search_term = None
+    search_description = None
     if search:
-        filters["search"] = search
-    
-    items, total = await USTariffFractionService.get_all(
-        db, tenant_id, company_id, skip, page_size, filters
-    )
-    
+        clean = search.replace(".", "")
+        if clean.isdigit() and len(clean) >= 4:
+            search_term = search
+        else:
+            search_description = search
+
+    try:
+        sitar_items = await svc.search(
+            fraccion=search_term,
+            descripcion=search_description,
+            skip=skip,
+            limit=page_size,
+        )
+    except Exception:
+        return {
+            "items": [],
+            "total": 0,
+            "page": page,
+            "page_size": page_size,
+            "pages": 0,
+        }
+
+    total = len(sitar_items) + skip
+    if len(sitar_items) == page_size:
+        total += 1
+
+    items = [
+        USTariffFractionResponseDTO.model_validate(_sitar_row_to_us_response_payload(row))
+        for row in sitar_items
+    ]
+
     return {
-        "items": [USTariffFractionResponseDTO.model_validate(item) for item in items],
+        "items": items,
         "total": total,
         "page": page,
         "page_size": page_size,
@@ -72,4 +133,28 @@ async def list_us_tariff_fractions(
     }
 
 
+@main_router.post("/")
+async def create_us_tariff_fraction_disabled():
+    raise HTTPException(
+        status_code=status.HTTP_405_METHOD_NOT_ALLOWED,
+        detail="US tariff fractions are read-only (SITAR).",
+    )
+
+
+@main_router.put("/{fraction_id}")
+async def update_us_tariff_fraction_disabled(fraction_id: int):
+    raise HTTPException(
+        status_code=status.HTTP_405_METHOD_NOT_ALLOWED,
+        detail="US tariff fractions are read-only (SITAR).",
+    )
+
+
+@main_router.delete("/{fraction_id}")
+async def delete_us_tariff_fraction_disabled(fraction_id: int):
+    raise HTTPException(
+        status_code=status.HTTP_405_METHOD_NOT_ALLOWED,
+        detail="US tariff fractions are read-only (SITAR).",
+    )
+
+
 router = main_router
diff --git a/backend/api/v1/modules/a76/items/exports/validators/common.py b/backend/api/v1/modules/a76/items/exports/validators/common.py
index d8e204f5..4acd302d 100644
--- a/backend/api/v1/modules/a76/items/exports/validators/common.py
+++ b/backend/api/v1/modules/a76/items/exports/validators/common.py
@@ -14,8 +14,9 @@ from api.v1.modules.a76.invoices.models import InvoiceHeader
 from api.v1.modules.a76.classes.models import Class
 from api.v1.modules.a76.general_catalogs.units_of_measure.models import UnitOfMeasure
 from api.v1.modules.a76.general_catalogs.packages.models import Package
-from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import (
-    USTariffFraction,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    resolve_american_fraction_from_sitar,
+    store_canonical_american_code,
 )
 from api.v1.modules.a24.fa.fa_item_lines.models import FaLineItem
 from api.v1.modules.public.reference_data.countries.models import Country
@@ -363,48 +364,8 @@ def validate_common(
                 )
 
     if line.customs.american_fraction:
-        def _normalize_american_fraction_code(raw_code: str) -> list[str]:
-            normalized_raw = (raw_code or "").strip()
-            if not normalized_raw:
-                return []
-
-            digits_only = normalized_raw.replace(".", "").replace(" ", "").replace("-", "")
-            candidates = [normalized_raw]
-
-            if len(digits_only) == 10:
-                candidates.append(
-                    f"{digits_only[:4]}.{digits_only[4:6]}.{digits_only[6:8]}.{digits_only[8:10]}"
-                )
-            elif len(digits_only) == 8:
-                candidates.append(f"{digits_only[:4]}.{digits_only[4:6]}.{digits_only[6:8]}")
-
-            candidates.append(digits_only)
-
-            seen: set[str] = set()
-            deduped: list[str] = []
-            for candidate in candidates:
-                if not candidate or candidate in seen:
-                    continue
-                seen.add(candidate)
-                deduped.append(candidate)
-            return deduped
-
-        candidates = _normalize_american_fraction_code(line.customs.american_fraction)
-        us_fraction: USTariffFraction | None = None
-        for candidate in candidates:
-            us_fraction = (
-                db.query(USTariffFraction)
-                .filter(
-                    USTariffFraction.code == candidate,
-                    USTariffFraction.tenant_id == tenant_id,
-                    USTariffFraction.company_id == company_id,
-                )
-                .first()
-            )
-            if us_fraction:
-                break
-
-        if not us_fraction:
+        resolved = resolve_american_fraction_from_sitar(str(line.customs.american_fraction))
+        if not resolved:
             errors.add_error(
                 field=f"line[{line_number}].customs.american_fraction",
                 message="La fracción americana especificada no existe.",
@@ -412,7 +373,8 @@ def validate_common(
                 code="AMERICAN_FRACTION_NOT_FOUND",
             )
         else:
-            line.customs.american_fraction = us_fraction.code
+            _, canon = resolved
+            line.customs.american_fraction = store_canonical_american_code(canon)
 
     if line.order:
         if len(line.order) > 20:
diff --git a/backend/api/v1/modules/a76/items/exports/validators/create.py b/backend/api/v1/modules/a76/items/exports/validators/create.py
index 4c189ee0..1aaaf83f 100644
--- a/backend/api/v1/modules/a76/items/exports/validators/create.py
+++ b/backend/api/v1/modules/a76/items/exports/validators/create.py
@@ -10,8 +10,10 @@ from ...models import LineItem
 from api.v1.modules.a76.invoices.models import InvoiceHeader
 from api.v1.modules.a76.classes.models import Class
 from api.v1.modules.a76.general_catalogs.packages.models import Package
-from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import (
-    USTariffFraction,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    american_fraction_ad_valorem_from_row,
+    resolve_american_fraction_from_sitar,
+    store_canonical_american_code,
 )
 from api.v1.modules.public.reference_data.payment_methods.models import PaymentMethod
 from api.v1.modules.a76.app_settings.service import AppSettingsService
@@ -488,25 +490,15 @@ def validate_create(
         if not line.customs.american_fraction and class_info and class_info.us_fraction:
             line.customs.american_fraction = class_info.us_fraction
 
-        # Buscar el advalorem de la fracción americana
+        # Ad valorem desde catálogo SITAR (fracciones-usa)
         if line.customs.american_fraction:
-            us_fraction: USTariffFraction = (
-                db.query(USTariffFraction)
-                .filter(
-                    USTariffFraction.code == line.customs.american_fraction,
-                    USTariffFraction.tenant_id == tenant_id,
-                    USTariffFraction.company_id == company_id,
+            resolved = resolve_american_fraction_from_sitar(str(line.customs.american_fraction))
+            if resolved:
+                sitar_row, canon = resolved
+                line.customs.american_fraction = store_canonical_american_code(canon)
+                line.customs.advalorem_american = american_fraction_ad_valorem_from_row(
+                    sitar_row
                 )
-                .first()
-            )
-
-            if us_fraction:
-                # Si el tipo es 'ME' (Moneda Extranjera), usar costo fijo
-                # De lo contrario, usar ad valorem
-                if us_fraction.type_code == "foreign":
-                    line.customs.advalorem_american = us_fraction.fixed_cost
-                else:
-                    line.customs.advalorem_american = us_fraction.ad_valorem
 
         # ==========================================
         # ASIGNAR DESCRIPCIONES POR DEFECTO
diff --git a/backend/api/v1/modules/a76/items/exports/validators/update.py b/backend/api/v1/modules/a76/items/exports/validators/update.py
index 758c71de..2d3e13e9 100644
--- a/backend/api/v1/modules/a76/items/exports/validators/update.py
+++ b/backend/api/v1/modules/a76/items/exports/validators/update.py
@@ -6,8 +6,10 @@ from core.exceptions import ErrorCollector
 from ...models import LineItem
 from api.v1.modules.a24.fa.fa_item_lines.models import FaLineItem
 from api.v1.modules.a76.invoices.models import InvoiceHeader
-from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import (
-    USTariffFraction,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    american_fraction_ad_valorem_from_row,
+    resolve_american_fraction_from_sitar,
+    store_canonical_american_code,
 )
 from api.v1.modules.a76.classes.models import Class
 from .common import validate_common
@@ -158,24 +160,15 @@ def validate_update(
         if not line.customs.sector:
             line.customs.sector = existing_line.customs.sector
 
-        # Fracción americana y su advalorem
+        # Fracción americana y su advalorem (SITAR)
         if line.customs.american_fraction:
-            # Se proporcionó nueva fracción americana, buscar su advalorem
-            us_fraction: USTariffFraction = (
-                db.query(USTariffFraction)
-                .filter(
-                    USTariffFraction.code == line.customs.american_fraction,
-                    USTariffFraction.tenant_id == tenant_id,
-                    USTariffFraction.company_id == company_id,
+            resolved = resolve_american_fraction_from_sitar(str(line.customs.american_fraction))
+            if resolved:
+                sitar_row, canon = resolved
+                line.customs.american_fraction = store_canonical_american_code(canon)
+                line.customs.advalorem_american = american_fraction_ad_valorem_from_row(
+                    sitar_row
                 )
-                .first()
-            )
-
-            if us_fraction:
-                if us_fraction.type_code == "ME":
-                    line.customs.advalorem_american = us_fraction.fixed_cost
-                else:
-                    line.customs.advalorem_american = us_fraction.ad_valorem
         else:
             # Mantener fracción americana existente
             line.customs.american_fraction = existing_line.customs.american_fraction
diff --git a/backend/api/v1/modules/a76/items/imports/validators/common.py b/backend/api/v1/modules/a76/items/imports/validators/common.py
index 7104b545..3ab71464 100644
--- a/backend/api/v1/modules/a76/items/imports/validators/common.py
+++ b/backend/api/v1/modules/a76/items/imports/validators/common.py
@@ -9,8 +9,9 @@ from ...common.fractions import search_fraction_preference
 from ...common.common_validators import item_exists
 from ...models import LineItem
 from ...line_customs.models import FractionType, LineCustom
-from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import (
-    USTariffFraction,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    resolve_american_fraction_from_sitar,
+    store_canonical_american_code,
 )
 from api.v1.modules.a76.items.schemas import LineItemCreate
 from api.v1.modules.a76.invoices.models import InvoiceHeader
@@ -26,9 +27,6 @@ from api.v1.modules.a76.parts.models import Part
 from api.v1.modules.a76.app_settings.service import AppSettingsService
 from api.v1.modules.a76.general_catalogs.company.models import Company
 
-import re
-
-
 def validate_common(
     db: Session,
     line: LineItemCreate,
@@ -291,66 +289,9 @@ def validate_common(
                 )
 
     if line.customs.american_fraction:
-        def _normalize_american_fraction_code(raw_code: str) -> list[str]:
-            """
-            Attempts to map user input to the canonical USTariffFraction.code.
-
-            The catalog commonly stores dotted HTS codes (e.g. 3802.20.00.00),
-            but users may paste/enter digits-only or use different separators.
-            """
-
-            normalized_raw = (raw_code or "").strip()
-            if not normalized_raw:
-                return []
-
-            digits_only = re.sub(r"[.\s\-]", "", normalized_raw)
-
-            candidates: list[str] = []
-
-            # 1) Exact input
-            candidates.append(normalized_raw)
-
-            # 2) Canonical with dots if length matches common patterns
-            if len(digits_only) == 10:
-                candidates.append(
-                    f"{digits_only[:4]}.{digits_only[4:6]}.{digits_only[6:8]}.{digits_only[8:10]}"
-                )
-            elif len(digits_only) == 8:
-                candidates.append(
-                    f"{digits_only[:4]}.{digits_only[4:6]}.{digits_only[6:8]}"
-                )
-
-            # 3) Digits-only (if catalog stores without dots)
-            candidates.append(digits_only)
-
-            # De-duplicate while preserving order
-            seen: set[str] = set()
-            deduped: list[str] = []
-            for c in candidates:
-                if not c or c in seen:
-                    continue
-                seen.add(c)
-                deduped.append(c)
-            return deduped
-
         raw_american_fraction = str(line.customs.american_fraction)
-        candidates = _normalize_american_fraction_code(raw_american_fraction)
-
-        us_fraction: USTariffFraction | None = None
-        for candidate in candidates:
-            us_fraction = (
-                db.query(USTariffFraction)
-                .filter(
-                    USTariffFraction.code == candidate,
-                    USTariffFraction.tenant_id == tenant_id,
-                    USTariffFraction.company_id == company_id,
-                )
-                .first()
-            )
-            if us_fraction:
-                break
-
-        if not us_fraction:
+        resolved = resolve_american_fraction_from_sitar(raw_american_fraction)
+        if not resolved:
             errors.add_error(
                 field=f"line[{line_number}].customs.american_fraction",
                 message="La fracción americana especificada no existe.",
@@ -358,8 +299,8 @@ def validate_common(
                 code="AMERICAN_FRACTION_NOT_FOUND",
             )
         else:
-            # Keep canonical value so downstream validators can use it safely.
-            line.customs.american_fraction = us_fraction.code
+            _, canon = resolved
+            line.customs.american_fraction = store_canonical_american_code(canon)
 
     if line.order:
         if len(line.order) > 20:
diff --git a/backend/api/v1/modules/a76/items/imports/validators/create.py b/backend/api/v1/modules/a76/items/imports/validators/create.py
index 4a5f3958..daa3d52a 100644
--- a/backend/api/v1/modules/a76/items/imports/validators/create.py
+++ b/backend/api/v1/modules/a76/items/imports/validators/create.py
@@ -10,8 +10,10 @@ from ...models import LineItem
 from api.v1.modules.a76.invoices.models import InvoiceHeader
 from api.v1.modules.a76.classes.models import Class
 from api.v1.modules.a76.general_catalogs.packages.models import Package
-from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import (
-    USTariffFraction,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    american_fraction_ad_valorem_from_row,
+    resolve_american_fraction_from_sitar,
+    store_canonical_american_code,
 )
 from api.v1.modules.a76.app_settings.service import AppSettingsService
 from .common import validate_common
@@ -381,25 +383,15 @@ def validate_create(
         if not line.customs.american_fraction and class_info and class_info.us_fraction:
             line.customs.american_fraction = class_info.us_fraction
 
-        # Buscar el advalorem de la fracción americana
+        # Ad valorem desde catálogo SITAR (fracciones-usa)
         if line.customs.american_fraction:
-            us_fraction: USTariffFraction = (
-                db.query(USTariffFraction)
-                .filter(
-                    USTariffFraction.code == line.customs.american_fraction,
-                    USTariffFraction.tenant_id == tenant_id,
-                    USTariffFraction.company_id == company_id,
+            resolved = resolve_american_fraction_from_sitar(str(line.customs.american_fraction))
+            if resolved:
+                sitar_row, canon = resolved
+                line.customs.american_fraction = store_canonical_american_code(canon)
+                line.customs.advalorem_american = american_fraction_ad_valorem_from_row(
+                    sitar_row
                 )
-                .first()
-            )
-
-            if us_fraction:
-                # Si el tipo es 'ME' (Moneda Extranjera), usar costo fijo
-                # De lo contrario, usar ad valorem
-                if us_fraction.type_code == "foreign":
-                    line.customs.advalorem_american = us_fraction.fixed_cost
-                else:
-                    line.customs.advalorem_american = us_fraction.ad_valorem
 
         # ==========================================
         # ASIGNAR DESCRIPCIONES POR DEFECTO
diff --git a/backend/api/v1/modules/a76/items/imports/validators/update.py b/backend/api/v1/modules/a76/items/imports/validators/update.py
index ad18716d..3f891e0a 100644
--- a/backend/api/v1/modules/a76/items/imports/validators/update.py
+++ b/backend/api/v1/modules/a76/items/imports/validators/update.py
@@ -4,8 +4,10 @@ from core.exceptions import ErrorCollector
 
 from ...models import LineItem
 from api.v1.modules.a76.invoices.models import InvoiceHeader
-from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import (
-    USTariffFraction,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    american_fraction_ad_valorem_from_row,
+    resolve_american_fraction_from_sitar,
+    store_canonical_american_code,
 )
 from .common import validate_common
 
@@ -155,24 +157,15 @@ def validate_update(
         if not line.customs.sector:
             line.customs.sector = existing_line.customs.sector
 
-        # Fracción americana y su advalorem
+        # Fracción americana y su advalorem (SITAR)
         if line.customs.american_fraction:
-            # Se proporcionó nueva fracción americana, buscar su advalorem
-            us_fraction: USTariffFraction = (
-                db.query(USTariffFraction)
-                .filter(
-                    USTariffFraction.code == line.customs.american_fraction,
-                    USTariffFraction.tenant_id == tenant_id,
-                    USTariffFraction.company_id == company_id,
+            resolved = resolve_american_fraction_from_sitar(str(line.customs.american_fraction))
+            if resolved:
+                sitar_row, canon = resolved
+                line.customs.american_fraction = store_canonical_american_code(canon)
+                line.customs.advalorem_american = american_fraction_ad_valorem_from_row(
+                    sitar_row
                 )
-                .first()
-            )
-
-            if us_fraction:
-                if us_fraction.type_code == "ME":
-                    line.customs.advalorem_american = us_fraction.fixed_cost
-                else:
-                    line.customs.advalorem_american = us_fraction.ad_valorem
         else:
             # Mantener fracción americana existente
             line.customs.american_fraction = existing_line.customs.american_fraction
diff --git a/backend/api/v1/modules/a76/layouts_csv/classes/common/fk_loader.py b/backend/api/v1/modules/a76/layouts_csv/classes/common/fk_loader.py
index 95f331d6..3d3b401c 100644
--- a/backend/api/v1/modules/a76/layouts_csv/classes/common/fk_loader.py
+++ b/backend/api/v1/modules/a76/layouts_csv/classes/common/fk_loader.py
@@ -1,6 +1,6 @@
 """
-Carga de conjuntos FK para validación/mapeo de import CSV de clases de materiales.
-Clarion: Tipo Activo Fijo, U.M., Fracción Mex (GFracGenSifra + histórico), Fracción Ame (GFracAme), Código Producto CP (si existe).
+Carga de conjuntos FK para validaci?n/mapeo de import CSV de clases de materiales.
+Clarion: Tipo Activo Fijo, U.M., Fracci?n Mex (GFracGenSifra + hist?rico), Fracci?n Ame (GFracAme), C?digo Producto CP (si existe).
 """
 from typing import Set, Tuple
 
@@ -12,11 +12,11 @@ def load_classes_fk_sets(
     company_id: int,
 ) -> Tuple[Set[str], Set[str], Set[str], Set[str], Set[str]]:
     """
-    Carga todos los conjuntos necesarios para validación CSV de clases (paridad Clarion).
+    Carga todos los conjuntos necesarios para validaci?n CSV de clases (paridad Clarion).
     Devuelve (valid_material_keys, valid_uom_codes, valid_fraction_mex_8, valid_fraction_ame, valid_product_codes_cp).
-    - valid_fraction_mex_8: códigos de 8 caracteres válidos (TariffFraction + HistoricalTariffFraction).
-    - valid_fraction_ame: códigos de fracción americana (USTariffFraction por tenant/company).
-    - valid_product_codes_cp: códigos de producto/servicio CP (vacío si no existe catálogo).
+    - valid_fraction_mex_8: c?digos de 8 caracteres v?lidos (TariffFraction + HistoricalTariffFraction).
+    - valid_fraction_ame: c?digos de fracci?n americana (USTariffFraction por tenant/company).
+    - valid_product_codes_cp: c?digos de producto/servicio CP (vac?o si no existe cat?logo).
     """
     valid_material_keys: Set[str] = set()
     valid_uom_codes: Set[str] = set()
@@ -29,8 +29,6 @@ def load_classes_fk_sets(
             from api.v1.modules.a76.general_catalogs.units_of_measure.models import UnitOfMeasure
             from api.v1.modules.a76.general_catalogs.fractions.tariff_fractions.models import TariffFraction
             from api.v1.modules.a76.general_catalogs.fractions.historical_tariff_fractions.models import HistoricalTariffFraction
-            from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import USTariffFraction
-
             for m in session.query(MaterialType.key).all():
                 if m[0]:
                     valid_material_keys.add(m[0])
@@ -63,16 +61,7 @@ def load_classes_fk_sets(
                 if row[0] and row[0].strip():
                     valid_fraction_mex_8.add(row[0].strip()[:8])
 
-            for row in (
-                session.query(USTariffFraction.code)
-                .filter(
-                    USTariffFraction.tenant_id == tenant_id,
-                    USTariffFraction.company_id == company_id,
-                )
-                .all()
-            ):
-                if row[0]:
-                    valid_fraction_ame.add(row[0].strip())
+            # Fracci?n americana: validaci?n por fila contra SITAR (no se precarga el cat?logo completo).
 
     except Exception as e:
         import logging
diff --git a/backend/api/v1/modules/a76/layouts_csv/classes/validators/common.py b/backend/api/v1/modules/a76/layouts_csv/classes/validators/common.py
index fad8ded8..a5ea6b7e 100644
--- a/backend/api/v1/modules/a76/layouts_csv/classes/validators/common.py
+++ b/backend/api/v1/modules/a76/layouts_csv/classes/validators/common.py
@@ -144,20 +144,23 @@ def validate_row_fraction_mex_catalog(
 def validate_row_fraction_ame_catalog(
     row: Dict[str, Any],
     line_num: int,
-    valid_fraction_ame: Optional[Set[str]],
+    valid_fraction_ame: Optional[Set[str]] = None,
 ) -> Optional[Dict[str, Any]]:
-    """Col G: si no vacía, debe existir en catálogo Fracciones Americanas (Clarion GFracAme)."""
+    """Col G: si no vacía, debe existir en SITAR fracciones-usa (valid_fraction_ame ignorado; compat)."""
+    from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+        resolve_american_fraction_from_sitar,
+    )
+
     val = (row.get("FRACCIONAME") or "").strip()
-    if not val or valid_fraction_ame is None:
+    if not val:
         return None
-    if val in valid_fraction_ame:
+    if resolve_american_fraction_from_sitar(val):
         return None
     return {
         "line": line_num,
         "col": "FRACCIONAME",
         "msg": (
-            f"Error: (Col. G) La Fraccion Americana: {val} no existe en el Catálogo de Fracciones Americanas. "
-            "Dar de alta la Fracción Americana en el Catálogo de Fracciones Americanas."
+            f"Error: (Col. G) La Fraccion Americana: {val} no existe en el catálogo SITAR (fracciones USA)."
         ),
     }
 
diff --git a/backend/api/v1/modules/a76/layouts_csv/facturas/line_item_enrichment/import_enrichment.py b/backend/api/v1/modules/a76/layouts_csv/facturas/line_item_enrichment/import_enrichment.py
index afbf83c2..9ce52568 100644
--- a/backend/api/v1/modules/a76/layouts_csv/facturas/line_item_enrichment/import_enrichment.py
+++ b/backend/api/v1/modules/a76/layouts_csv/facturas/line_item_enrichment/import_enrichment.py
@@ -11,8 +11,10 @@ from api.v1.modules.a76.invoices.models import InvoiceHeader
 from api.v1.modules.a76.classes.models import Class
 from api.v1.modules.a76.parts.models import Part
 from api.v1.modules.a76.general_catalogs.packages.models import Package
-from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import (
-    USTariffFraction,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    american_fraction_ad_valorem_from_row,
+    resolve_american_fraction_from_sitar,
+    store_canonical_american_code,
 )
 from api.v1.modules.a24.fa.fa_item_lines.dto import FaLineItemCreateDTO
 
@@ -215,20 +217,15 @@ def apply_import_defaults_and_calculations_for_csv(
         line_data.customs.american_fraction = class_info.us_fraction
 
     if line_data.customs.american_fraction:
-        us_fraction = (
-            db.query(USTariffFraction)
-            .filter(
-                USTariffFraction.code == line_data.customs.american_fraction,
-                USTariffFraction.tenant_id == tenant_id,
-                USTariffFraction.company_id == company_id,
-            )
-            .first()
+        resolved = resolve_american_fraction_from_sitar(
+            str(line_data.customs.american_fraction)
         )
-        if us_fraction:
-            if getattr(us_fraction, "type_code", None) == "foreign":
-                line_data.customs.advalorem_american = us_fraction.fixed_cost
-            else:
-                line_data.customs.advalorem_american = us_fraction.ad_valorem
+        if resolved:
+            sitar_row, canon = resolved
+            line_data.customs.american_fraction = store_canonical_american_code(canon)
+            line_data.customs.advalorem_american = american_fraction_ad_valorem_from_row(
+                sitar_row
+            )
 
     # Fallback explícito: primero descripción de parte (si existe), luego clase.
     if not line_data.description.description_spanish and part and part.description_spanish:
diff --git a/backend/api/v1/modules/a76/layouts_csv/facturas/tasks.py b/backend/api/v1/modules/a76/layouts_csv/facturas/tasks.py
index 0c279146..2bf46101 100644
--- a/backend/api/v1/modules/a76/layouts_csv/facturas/tasks.py
+++ b/backend/api/v1/modules/a76/layouts_csv/facturas/tasks.py
@@ -1248,7 +1248,6 @@ def _do_scan_file(self, job_id: str, model_target: str, config: Optional[str] =
             from api.v1.modules.a76.general_catalogs.sectors.models import Sector
             from api.v1.modules.public.reference_data.valuation_methods.models import ValuationMethod
             from api.v1.modules.public.reference_data.payment_methods.models import PaymentMethod
-            from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import USTariffFraction
             from api.v1.modules.a76.general_catalogs.company.models import Company
             from api.v1.modules.a76.parts.models import Part
             from .validators.partidas_impo_temp import validate_row_partidas_impo_temp
@@ -1369,10 +1368,7 @@ def _do_scan_file(self, job_id: str, model_target: str, config: Optional[str] =
                     if row[1]:
                         valid_country_keys.add((row[1] or "").strip().upper())
 
-                valid_fraction_ame: Set[str] = set()
-                for row in session.query(USTariffFraction.code).filter(USTariffFraction.tenant_id == tenant_id, USTariffFraction.company_id == company_id).all():
-                    if row[0]:
-                        valid_fraction_ame.add((row[0] or "").strip())
+                valid_fraction_ame: Set[str] = set()  # unused; SITAR resolve per row in validators
 
                 authorized_sectors: Set[str] = set()
                 for row in session.query(Sector.key).filter(
@@ -1630,7 +1626,6 @@ def _do_scan_file(self, job_id: str, model_target: str, config: Optional[str] =
             from api.v1.modules.a76.general_catalogs.sectors.models import Sector
             from api.v1.modules.public.reference_data.valuation_methods.models import ValuationMethod
             from api.v1.modules.public.reference_data.payment_methods.models import PaymentMethod
-            from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import USTariffFraction
             from api.v1.modules.a76.general_catalogs.company.models import Company
             from api.v1.modules.a76.parts.models import Part
             from .validators.partidas_impo_def import validate_row_partidas_impo_def
@@ -1753,10 +1748,7 @@ def _do_scan_file(self, job_id: str, model_target: str, config: Optional[str] =
                     if row[1]:
                         valid_country_keys.add((row[1] or "").strip().upper())
 
-                valid_fraction_ame: Set[str] = set()
-                for row in session.query(USTariffFraction.code).filter(USTariffFraction.tenant_id == tenant_id, USTariffFraction.company_id == company_id).all():
-                    if row[0]:
-                        valid_fraction_ame.add((row[0] or "").strip())
+                valid_fraction_ame: Set[str] = set()  # unused; SITAR resolve per row in validators
 
                 authorized_sectors: Set[str] = set()
                 for row in session.query(Sector.key).filter(
@@ -1915,7 +1907,6 @@ def _do_scan_file(self, job_id: str, model_target: str, config: Optional[str] =
             from api.v1.modules.a76.general_catalogs.units_of_measure.models import UnitOfMeasure
             from api.v1.modules.a76.general_catalogs.packages.models import Package
             from api.v1.modules.public.reference_data.payment_methods.models import PaymentMethod
-            from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import USTariffFraction
             from api.v1.modules.a76.general_catalogs.company.models import Company
             from api.v1.modules.a76.parts.models import Part
             from .validators.partidas_expo import validate_row_partidas_expo
@@ -2075,10 +2066,7 @@ def _do_scan_file(self, job_id: str, model_target: str, config: Optional[str] =
                     if row[0] is not None:
                         valid_payment_methods.add(str(row[0]).strip())
 
-                valid_fraction_ame: Set[str] = set()
-                for row in session.query(USTariffFraction.code).filter(USTariffFraction.tenant_id == tenant_id, USTariffFraction.company_id == company_id).all():
-                    if row[0]:
-                        valid_fraction_ame.add((row[0] or "").strip())
+                valid_fraction_ame: Set[str] = set()  # unused; SITAR resolve per row in validators
 
                 valid_part_numbers: Set[str] = set()
                 for row in session.query(Part.part_number).filter(Part.tenant_id == tenant_id, Part.company_id == company_id).all():
@@ -2209,7 +2197,6 @@ def _do_scan_file(self, job_id: str, model_target: str, config: Optional[str] =
             from api.v1.modules.a76.general_catalogs.sectors.models import Sector
             from api.v1.modules.public.reference_data.valuation_methods.models import ValuationMethod
             from api.v1.modules.public.reference_data.payment_methods.models import PaymentMethod
-            from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import USTariffFraction
             from api.v1.modules.a76.general_catalogs.company.models import Company
             from api.v1.modules.a76.parts.models import Part
             from .validators.partidas_impo_def import validate_row_partidas_impo_def
@@ -2331,10 +2318,7 @@ def _do_scan_file(self, job_id: str, model_target: str, config: Optional[str] =
                     if row[1]:
                         valid_country_keys.add((row[1] or "").strip().upper())
 
-                valid_fraction_ame: Set[str] = set()
-                for row in session.query(USTariffFraction.code).filter(USTariffFraction.tenant_id == tenant_id, USTariffFraction.company_id == company_id).all():
-                    if row[0]:
-                        valid_fraction_ame.add((row[0] or "").strip())
+                valid_fraction_ame: Set[str] = set()  # unused; SITAR resolve per row in validators
 
                 authorized_sectors: Set[str] = set()
                 for row in session.query(Sector.key).filter(
diff --git a/backend/api/v1/modules/a76/layouts_csv/facturas/validators/partidas_expo.py b/backend/api/v1/modules/a76/layouts_csv/facturas/validators/partidas_expo.py
index dea9652e..f4096474 100644
--- a/backend/api/v1/modules/a76/layouts_csv/facturas/validators/partidas_expo.py
+++ b/backend/api/v1/modules/a76/layouts_csv/facturas/validators/partidas_expo.py
@@ -400,14 +400,18 @@ def _validaciones_par_expo(
             f"Error: (Celda M{line_num}) La Forma de Pago Capturado no es Válido. "
             "Capturar en la Celda M una Forma de Pago dentro del Catálogo General de Formas de Pago.",
         )
-    # Fracción americana (Clarion Col R)
+    # Fracción americana (Clarion Col R) — SITAR fracciones-usa
+    from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+        resolve_american_fraction_from_sitar,
+    )
+
     frac_ame = _get(row, "FRACCION AMERICANA", "FRACCIONAMERICANA")
-    if frac_ame and valid_fraction_ame and frac_ame not in valid_fraction_ame:
+    if frac_ame and not resolve_american_fraction_from_sitar(frac_ame):
         return _err(
             line_num,
             "FRACCION AMERICANA",
-            f"Error: (Celda R{line_num}) La Fracción Americana: {frac_ame} no está en el Catálogo de Fracciones Americanas. "
-            "Capturar en la Celda R una fracción que se encuentre en el catálogo o dar la de alta.",
+            f"Error: (Celda R{line_num}) La Fracción Americana: {frac_ame} no está en el catálogo SITAR (fracciones USA). "
+            "Capturar en la Celda R una fracción válida según SITAR.",
         )
     # Orden de compra / orden venta (Clarion Col S) máx 20
     orden = _get(row, "ORDEN DE COMPRA", "ORDENCOMPRA", "ORDEN DE VENTA")
diff --git a/backend/api/v1/modules/a76/layouts_csv/facturas/validators/partidas_impo_temp.py b/backend/api/v1/modules/a76/layouts_csv/facturas/validators/partidas_impo_temp.py
index 54e2ebe4..f69350f4 100644
--- a/backend/api/v1/modules/a76/layouts_csv/facturas/validators/partidas_impo_temp.py
+++ b/backend/api/v1/modules/a76/layouts_csv/facturas/validators/partidas_impo_temp.py
@@ -366,10 +366,17 @@ def _validaciones_parimpo_tem(
             f"Error: (Celda M{line_num} y N{line_num}) La Preferencia Arancelaria es: {pref_ctx} y en la columna N tiene sector.",
         )
 
-    # O: Fracción americana
+    # O: Fracción americana (SITAR fracciones-usa; valid_fraction_ame ignorado)
+    from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+        resolve_american_fraction_from_sitar,
+    )
+
     frac_ame = _get(row, "FRACCION AMERICANA", "FRACCIONAMERICANA")
-    if frac_ame and frac_ame not in valid_fraction_ame:
-        return err("FRACCION AMERICANA", f"Advertencia: (Celda O{line_num}) La Fracción Americana: {frac_ame} no existe en el Catálogo de Fracciones Americanas.")
+    if frac_ame and not resolve_american_fraction_from_sitar(frac_ame):
+        return err(
+            "FRACCION AMERICANA",
+            f"Advertencia: (Celda O{line_num}) La Fracción Americana: {frac_ame} no existe en el catálogo SITAR (fracciones USA).",
+        )
 
     # P: Orden de compra máx 20
     orden = _get(row, "ORDEN DE COMPRA", "ORDENCOMPRA")
diff --git a/backend/api/v1/modules/a76/layouts_csv/us_tariff_fractions/common/fk_loader.py b/backend/api/v1/modules/a76/layouts_csv/us_tariff_fractions/common/fk_loader.py
index e2da98a4..10ffa10b 100644
--- a/backend/api/v1/modules/a76/layouts_csv/us_tariff_fractions/common/fk_loader.py
+++ b/backend/api/v1/modules/a76/layouts_csv/us_tariff_fractions/common/fk_loader.py
@@ -15,15 +15,13 @@ def load_fa_fk_sets(
     Carga conjuntos para validación CSV Fracciones Americanas (paridad Clarion).
     Devuelve (valid_uom_codes, existing_fraction_codes).
     - valid_uom_codes: códigos de Unidad de Medida (a76.units_of_measure, code UPPER, max 5 chars).
-    - existing_fraction_codes: códigos de USTariffFraction ya existentes por tenant/company.
+    - existing_fraction_codes: reservado (vacío); existencia se valida contra SITAR por fila.
     """
     valid_uom_codes: Set[str] = set()
     existing_fraction_codes: Set[str] = set()
     try:
         with CoreSessionLocal() as session:
             from api.v1.modules.a76.general_catalogs.units_of_measure.models import UnitOfMeasure
-            from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import USTariffFraction
-
             for row in (
                 session.query(UnitOfMeasure.code)
                 .filter(
@@ -35,17 +33,6 @@ def load_fa_fk_sets(
                 if row[0]:
                     valid_uom_codes.add((row[0].strip() or "").upper()[:5])
 
-            for row in (
-                session.query(USTariffFraction.code)
-                .filter(
-                    USTariffFraction.tenant_id == tenant_id,
-                    USTariffFraction.company_id == company_id,
-                )
-                .all()
-            ):
-                if row[0]:
-                    existing_fraction_codes.add(row[0].strip())
-
     except Exception as e:
         import logging
         logging.getLogger(__name__).warning("FA import: could not load FK sets: %s", e)
diff --git a/backend/api/v1/modules/a76/layouts_csv/us_tariff_fractions/validators/common.py b/backend/api/v1/modules/a76/layouts_csv/us_tariff_fractions/validators/common.py
index 9b72342f..d9e071b3 100644
--- a/backend/api/v1/modules/a76/layouts_csv/us_tariff_fractions/validators/common.py
+++ b/backend/api/v1/modules/a76/layouts_csv/us_tariff_fractions/validators/common.py
@@ -16,6 +16,9 @@ from ..common.common_validators import (
     CODE_MAX,
 )
 from ..common.common_validators import TIPO_ADVALOREM_VALIDOS  # noqa: F401 re-export
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    resolve_american_fraction_from_sitar,
+)
 
 # Mensajes Clarion
 MSG_COL_A_VACIO = (
@@ -156,7 +159,8 @@ def validate_row_us_tariff_fraction(
 
     code_norm = normalize_code((row.get("FRACCION_ARANCELARIA") or "").strip())
     fraction_exists = (
-        existing_fraction_codes is not None and code_norm in existing_fraction_codes
+        bool(code_norm)
+        and resolve_american_fraction_from_sitar(code_norm) is not None
     )
 
     if actualizar and not fraction_exists:
diff --git a/backend/api/v1/modules/a76/reports/importacion/consolidados/mex/service.py b/backend/api/v1/modules/a76/reports/importacion/consolidados/mex/service.py
index c90b81b1..28e17498 100644
--- a/backend/api/v1/modules/a76/reports/importacion/consolidados/mex/service.py
+++ b/backend/api/v1/modules/a76/reports/importacion/consolidados/mex/service.py
@@ -50,8 +50,9 @@ from .schemas import (
     FacturaImportacionCompleta,
 )
 
-from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import (
-    USTariffFraction,
+from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+    american_fraction_ad_valorem_from_row,
+    resolve_american_fraction_from_sitar,
 )
 
 
@@ -700,21 +701,17 @@ class ConsolidadoImportacionMexService:
                 current_agg = aggregated_data[agg_key]
 
                 if not current_agg["description"]:
-                    us_frac_db = (
-                        db.query(USTariffFraction)
-                        .filter(USTariffFraction.code == us_frac_clean)
-                        .first()
+                    resolved = (
+                        resolve_american_fraction_from_sitar(us_frac_clean)
+                        if us_frac_clean
+                        else None
                     )
-                    if us_frac_db:
+                    if resolved:
+                        sitar_row, _canon = resolved
                         current_agg["description"] = (
-                            us_frac_db.description or "Sin Descripción"
+                            (sitar_row.DESCRIPCION or "").strip() or "Sin Descripción"
                         )
-                        # Parse AdValorem from DB if available, else 0 ??
-                        # Creating logical placeholder. The provided Clarion code used `FraAme.Adv`
-                        adv_val = (
-                            us_frac_db.ad_valorem
-                        )  # Assuming field exists based on viewing file later?
-                        # Wait, in us-tariff-fractions.ts I saw `ad_valorem: number | null`.
+                        adv_val = american_fraction_ad_valorem_from_row(sitar_row)
                         current_agg["advalorem_txt"] = (
                             f"{adv_val}%" if adv_val is not None else "0%"
                         )
diff --git a/backend/api/v1/modules/a76/reports/importacion/consolidados/temporary/mex/service.py b/backend/api/v1/modules/a76/reports/importacion/consolidados/temporary/mex/service.py
index d942d1ce..6aa530ae 100644
--- a/backend/api/v1/modules/a76/reports/importacion/consolidados/temporary/mex/service.py
+++ b/backend/api/v1/modules/a76/reports/importacion/consolidados/temporary/mex/service.py
@@ -370,7 +370,10 @@ class ConsolidadoImportacionMexService:
             invoices_list = db.query(InvoiceHeader).filter(InvoiceHeader.id.in_(target_invoice_ids)).all()
             invoice_map = {inv.id: inv for inv in invoices_list}
 
-            from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.models import USTariffFraction
+            from api.v1.modules.sitar.fracciones_usa.catalog_resolve import (
+                american_fraction_ad_valorem_from_row,
+                resolve_american_fraction_from_sitar,
+            )
 
             for line in lines:
                 qty = db.query(LineQuantity).filter(LineQuantity.item_line_id == line.id).first()
@@ -510,14 +513,20 @@ class ConsolidadoImportacionMexService:
                 current_agg = aggregated_data[agg_key]
                 
                 if not current_agg["description"]:
-                    us_frac_db = db.query(USTariffFraction).filter(USTariffFraction.code == us_frac_clean).first()
-                    if us_frac_db:
-                         current_agg["description"] = us_frac_db.description or "Sin Descripción"
-                         # Parse AdValorem from DB if available, else 0 ?? 
-                         # Creating logical placeholder. The provided Clarion code used `FraAme.Adv`
-                         adv_val = us_frac_db.ad_valorem # Assuming field exists based on viewing file later?
-                         # Wait, in us-tariff-fractions.ts I saw `ad_valorem: number | null`.
-                         current_agg["advalorem_txt"] = f"{adv_val}%" if adv_val is not None else "0%"
+                    resolved = (
+                        resolve_american_fraction_from_sitar(us_frac_clean)
+                        if us_frac_clean
+                        else None
+                    )
+                    if resolved:
+                        sitar_row, _canon = resolved
+                        current_agg["description"] = (
+                            (sitar_row.DESCRIPCION or "").strip() or "Sin Descripción"
+                        )
+                        adv_val = american_fraction_ad_valorem_from_row(sitar_row)
+                        current_agg["advalorem_txt"] = (
+                            f"{adv_val}%" if adv_val is not None else "0%"
+                        )
                     else:
                          current_agg["description"] = part_master.description_spanish if part_master else "S/D"
 
diff --git a/backend/api/v1/modules/sitar/common/base_service.py b/backend/api/v1/modules/sitar/common/base_service.py
index e58d62b3..a8e1f077 100644
--- a/backend/api/v1/modules/sitar/common/base_service.py
+++ b/backend/api/v1/modules/sitar/common/base_service.py
@@ -116,3 +116,47 @@ class SitarAPIBaseService:
                     pass
 
             return response.json()
+
+    def _get_token_sync(self) -> str:
+        """Same token cache as async path; safe for sync validators (no running asyncio loop)."""
+        if self._token and self._token_expires and datetime.now() < self._token_expires:
+            return self._token
+
+        login_url = f"{self.base_url}/fractions/api/v1/auth/login"
+        payload = {"username": self.username, "password": self.password}
+
+        with httpx.Client(timeout=self.timeout) as client:
+            response = client.post(login_url, json=payload)
+            response.raise_for_status()
+            data = response.json()
+            token = data.get("access_token") or data.get("token")
+            if not token:
+                raise ValueError("No token received from SITAR API")
+            self._token = token
+            self._token_expires = datetime.now() + timedelta(hours=1)
+            return token
+
+    def _make_request_sync(
+        self,
+        method: str,
+        endpoint: str,
+        params: Optional[Dict[str, Any]] = None,
+        json_data: Optional[Dict[str, Any]] = None,
+    ) -> Any:
+        token = self._get_token_sync()
+        endpoint = endpoint.lstrip("/")
+        url = f"{self.base_url}/fractions/{endpoint}"
+        headers = {
+            "Authorization": f"Bearer {token}",
+            "Content-Type": "application/json",
+        }
+        with httpx.Client(timeout=self.timeout) as client:
+            response = client.request(
+                method=method,
+                url=url,
+                params=params,
+                json=json_data,
+                headers=headers,
+            )
+            response.raise_for_status()
+            return response.json()
diff --git a/backend/api/v1/modules/sitar/fracciones_usa/catalog_resolve.py b/backend/api/v1/modules/sitar/fracciones_usa/catalog_resolve.py
new file mode 100644
index 00000000..087ba1c5
--- /dev/null
+++ b/backend/api/v1/modules/sitar/fracciones_usa/catalog_resolve.py
@@ -0,0 +1,124 @@
+"""
+Resolve American (US) tariff fraction codes against SITAR fracciones-usa.
+Used by sync validators and CSV/layout enrichment (no asyncio.run).
+"""
+
+from __future__ import annotations
+
+import re
+from typing import List, Optional, Tuple
+
+from .schemas import FraccionesUSAResponse
+from .service import FraccionesUSAService
+
+
+def normalize_american_fraction_code_candidates(raw_code: str) -> List[str]:
+    """
+    Map user input to candidate strings to query SITAR (dotted HTS vs digits-only).
+    Mirrors logic in items imports/validators/common.py.
+    """
+    normalized_raw = (raw_code or "").strip()
+    if not normalized_raw:
+        return []
+
+    digits_only = re.sub(r"[.\s\-]", "", normalized_raw)
+
+    candidates: List[str] = []
+    candidates.append(normalized_raw)
+
+    if len(digits_only) == 10:
+        candidates.append(
+            f"{digits_only[:4]}.{digits_only[4:6]}.{digits_only[6:8]}.{digits_only[8:10]}"
+        )
+    elif len(digits_only) == 8:
+        candidates.append(
+            f"{digits_only[:4]}.{digits_only[4:6]}.{digits_only[6:8]}"
+        )
+
+    candidates.append(digits_only)
+
+    seen: set[str] = set()
+    deduped: List[str] = []
+    for c in candidates:
+        if not c or c in seen:
+            continue
+        seen.add(c)
+        deduped.append(c)
+    return deduped
+
+
+def _digits(code: str) -> str:
+    return re.sub(r"[.\s\-]", "", code or "")
+
+
+def canonical_code_from_sitar_row(item: FraccionesUSAResponse) -> str:
+    """Same precedence as USTariffFractionMapper.to_domain for stored line value."""
+    return (
+        (item.FRACCION_CON_PUNTO or item.FRACCION_MOSTRAR or item.FRACCION_SIN_PUNTO or "")
+        .strip()
+    )
+
+
+def resolve_american_fraction_from_sitar(
+    raw_code: str,
+) -> Optional[Tuple[FraccionesUSAResponse, str]]:
+    """
+    Returns (SITAR row, canonical_code) if found, else None.
+    canonical_code is suitable for persisting on line customs / exports.
+    """
+    if not (raw_code or "").strip():
+        return None
+
+    target_digits = _digits(raw_code)
+    if not target_digits:
+        return None
+
+    candidates = normalize_american_fraction_code_candidates(raw_code)
+    tried_searches: set[tuple[Optional[str], Optional[str]]] = set()
+
+    for cand in candidates:
+        clean = cand.replace(".", "").replace("-", "").replace(" ", "")
+        if clean.isdigit() and len(clean) >= 4:
+            search_frac, search_desc = cand, None
+        else:
+            search_frac, search_desc = None, cand
+
+        key = (search_frac, search_desc)
+        if key in tried_searches:
+            continue
+        tried_searches.add(key)
+
+        rows = FraccionesUSAService.search_sync(
+            fraccion=search_frac,
+            descripcion=search_desc,
+            skip=0,
+            limit=100,
+        )
+        for row in rows:
+            canon = canonical_code_from_sitar_row(row)
+            if _digits(canon) == target_digits:
+                return (row, canon)
+
+    return None
+
+
+MAX_AMERICAN_FRACTION_DB_LEN = 16
+
+
+def store_canonical_american_code(canon: str) -> str:
+    """Fit SITAR canonical HTS string into DB column (VARCHAR 16)."""
+    s = (canon or "").strip()
+    if len(s) <= MAX_AMERICAN_FRACTION_DB_LEN:
+        return s
+    digits = re.sub(r"[.\s\-]", "", s)
+    return digits[:MAX_AMERICAN_FRACTION_DB_LEN]
+
+
+def american_fraction_ad_valorem_from_row(item: FraccionesUSAResponse) -> Optional[float]:
+    """Parse TARIFA1 like USTariffFractionMapper."""
+    if not item.TARIFA1:
+        return None
+    try:
+        return float(str(item.TARIFA1).replace("%", "").strip())
+    except (ValueError, TypeError):
+        return None
diff --git a/backend/api/v1/modules/sitar/fracciones_usa/service.py b/backend/api/v1/modules/sitar/fracciones_usa/service.py
index b1f739df..fe4b513c 100644
--- a/backend/api/v1/modules/sitar/fracciones_usa/service.py
+++ b/backend/api/v1/modules/sitar/fracciones_usa/service.py
@@ -1,9 +1,13 @@
 """Fracciones USA Service"""
 
-from typing import Optional, List, Dict, Any
+import logging
+from typing import Optional, List
+
 from ..common import SitarAPIBaseService
 from .schemas import FraccionesUSAResponse
 
+logger = logging.getLogger(__name__)
+
 
 
 class FraccionesUSAService(SitarAPIBaseService):
@@ -39,3 +43,35 @@ class FraccionesUSAService(SitarAPIBaseService):
         """Get single USA Fraccion record by CONSECUTIVO"""
         data = await self._make_request("GET", f"api/v1/fracciones-usa/{consecutivo}")
         return FraccionesUSAResponse(**data)
+
+    @classmethod
+    def search_sync(
+        cls,
+        fraccion: Optional[str] = None,
+        descripcion: Optional[str] = None,
+        skip: int = 0,
+        limit: int = 100,
+    ) -> List[FraccionesUSAResponse]:
+        """
+        Synchronous SITAR search for use from sync validators (FastAPI async routes
+        run sync code on the event loop; asyncio.run must not be used there).
+        """
+        try:
+            service = cls.get_instance()
+        except ValueError:
+            return []
+
+        params: dict = {"skip": skip, "limit": min(limit, 1000)}
+        if fraccion:
+            params["fraccion"] = fraccion
+        if descripcion:
+            params["descripcion"] = descripcion
+
+        try:
+            data = service._make_request_sync("GET", "api/v1/fracciones-usa/", params=params)
+            if not isinstance(data, list):
+                return []
+            return [FraccionesUSAResponse(**item) for item in data]
+        except Exception as exc:
+            logger.warning("SITAR fracciones-usa search_sync failed: %s", exc)
+            return []
diff --git a/frontend/e2e/setup-catalogs.spec.ts b/frontend/e2e/setup-catalogs.spec.ts
index cc1f14a6..c08e4a90 100644
--- a/frontend/e2e/setup-catalogs.spec.ts
+++ b/frontend/e2e/setup-catalogs.spec.ts
@@ -15,7 +15,8 @@ function saveCatalog(data: Record<string, string>) {
 // 8471.30.01 es una fraccion comun para equipos de computo — existe en SITAR
 const CLASS_CODE = 'E2E01'
 const CLASS_FRACTION = '12787'
-const CLASS_US_FRACTION = '12787'
+// HTS-style code resolvable via SITAR fracciones-usa (8 or 10 digit patterns used in UI)
+const CLASS_US_FRACTION = '8471300100'
 const CLASS_UM = 'KG'
 const CLASS_MATERIAL_KEY = 'EAGRI'
 const CLASS_DESC_ES = 'Clase E2E Test'
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 31e47ba2..57197776 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -805,24 +805,6 @@ export const api = {
 			fetchBlob(`/v1/a76/exchange-rate/imports/${jobId}/errors/scan-csv`)
 	},
 
-	// CSV import for Fracción Americana (us_tariff_fractions/imports)
-	americanFractionImports: {
-		upload: (file: File, companyId: number, uploadOptions?: CsvFormDataUploadOptions) => {
-			const formData = new FormData();
-			formData.append('file', file);
-			return fetchApiFormDataPost(
-				`/v1/a76/us-tariff-fractions/imports/upload?company_id=${companyId}`,
-				formData,
-				uploadOptions
-			);
-		},
-		status: (jobId: string) => api.get(`/v1/a76/us-tariff-fractions/imports/${jobId}/status`),
-		commit: (jobId: string) =>
-			api.post(`/v1/a76/us-tariff-fractions/imports/${jobId}/commit`, {}),
-		downloadScanErrorsCsv: (jobId: string) =>
-			fetchBlob(`/v1/a76/us-tariff-fractions/imports/${jobId}/errors/scan-csv`)
-	},
-
 	// CSV import for Pedimentos (pedimentos/imports)
 	pedimentosImports: {
 		upload: (
diff --git a/frontend/src/lib/api/dashboard/a76/general_catalogs/us-tariff-fractions.ts b/frontend/src/lib/api/dashboard/a76/general_catalogs/us-tariff-fractions.ts
index e2f5e1e2..d2cfac3c 100644
--- a/frontend/src/lib/api/dashboard/a76/general_catalogs/us-tariff-fractions.ts
+++ b/frontend/src/lib/api/dashboard/a76/general_catalogs/us-tariff-fractions.ts
@@ -1,37 +1,19 @@
 import { api } from '$lib/api';
 import type { ApiResponse } from '$lib/api';
 
-// Interfaces
+/** List item shape returned by GET /v1/a76/us-tariff-fractions/ (SITAR-backed, read-only). */
 export interface USTariffFraction {
 	id: number;
 	code: string;
-	prefix: string | null;
-	type_code: string | null;
-	ad_valorem: number | null;
-	fixed_cost: number | null;
-	unit_of_measure: string | null;
-	description: string | null;
-	created_at: string | null;
-	updated_at: string | null;
-}
-
-export interface USTariffFractionCreate {
-	code: string;
-	prefix?: string | null;
-	type_code?: string | null;
-	ad_valorem?: number | null;
-	fixed_cost?: number | null;
-	unit_of_measure?: string | null;
-	description?: string | null;
-}
-
-export interface USTariffFractionUpdate {
+	fraction?: string | null;
 	prefix?: string | null;
 	type_code?: string | null;
 	ad_valorem?: number | null;
 	fixed_cost?: number | null;
 	unit_of_measure?: string | null;
 	description?: string | null;
+	created_at?: string;
+	updated_at?: string;
 }
 
 export interface USTariffFractionListResponse {
@@ -42,47 +24,20 @@ export interface USTariffFractionListResponse {
 	pages: number;
 }
 
-// API Functions
+/** Paginated list from SITAR (same data as tariff-fractions?catalog=american). */
 export async function getUSTariffFractions(
 	page = 1,
 	pageSize = 50,
 	companyId: number,
-	filters: Record<string, any> = {}
+	filters: Record<string, string | number | boolean> = {}
 ): Promise<ApiResponse<USTariffFractionListResponse>> {
 	const queryParams = new URLSearchParams({
 		page: page.toString(),
 		page_size: pageSize.toString(),
 		company_id: companyId.toString(),
-		...filters
+		...Object.fromEntries(
+			Object.entries(filters).map(([k, v]) => [k, String(v)])
+		)
 	});
 	return await api.get(`/v1/a76/us-tariff-fractions/?${queryParams.toString()}`);
 }
-
-export async function getUSTariffFractionById(
-	id: number,
-	companyId: number
-): Promise<ApiResponse<USTariffFraction>> {
-	return await api.get(`/v1/a76/us-tariff-fractions/${id}/?company_id=${companyId}`);
-}
-
-export async function createUSTariffFraction(
-	data: USTariffFractionCreate,
-	companyId: number
-): Promise<ApiResponse<USTariffFraction>> {
-	return await api.post(`/v1/a76/us-tariff-fractions/?company_id=${companyId}`, data);
-}
-
-export async function updateUSTariffFraction(
-	id: number,
-	data: USTariffFractionUpdate,
-	companyId: number
-): Promise<ApiResponse<USTariffFraction>> {
-	return await api.put(`/v1/a76/us-tariff-fractions/${id}/?company_id=${companyId}`, data);
-}
-
-export async function deleteUSTariffFraction(
-	id: number,
-	companyId: number
-): Promise<ApiResponse<void>> {
-	return await api.delete(`/v1/a76/us-tariff-fractions/${id}/?company_id=${companyId}`);
-}
diff --git a/frontend/src/lib/components/dashboard/csv-upload/CsvPendingImportsSheet.svelte b/frontend/src/lib/components/dashboard/csv-upload/CsvPendingImportsSheet.svelte
index 5ffb0f1a..c9d03b91 100644
--- a/frontend/src/lib/components/dashboard/csv-upload/CsvPendingImportsSheet.svelte
+++ b/frontend/src/lib/components/dashboard/csv-upload/CsvPendingImportsSheet.svelte
@@ -40,7 +40,6 @@
 			customs_brokers: 'Agentes aduanales',
 			clients_providers: 'Clientes / proveedores',
 			exchange_rates: 'Tipos de cambio',
-			american_fractions: 'Fracciones arancelarias US',
 			pedimentos: 'Pedimentos',
 			material_classes: 'Clases de material',
 			vehicles: 'Vehículos',
diff --git a/frontend/src/lib/components/dashboard/csv-upload/ProcessingResultModal.svelte b/frontend/src/lib/components/dashboard/csv-upload/ProcessingResultModal.svelte
index dd342907..b15acaeb 100644
--- a/frontend/src/lib/components/dashboard/csv-upload/ProcessingResultModal.svelte
+++ b/frontend/src/lib/components/dashboard/csv-upload/ProcessingResultModal.svelte
@@ -37,7 +37,6 @@
 			| 'customs_brokers'
 			| 'clients_providers'
 			| 'exchange_rate'
-			| 'us_tariff_fractions'
 			| 'pedimentos'
 			| 'classes'
 			| 'vehicles'
@@ -139,9 +138,6 @@
 					case 'exchange_rate':
 						blob = await api.exchangeRateImports.downloadScanErrorsCsv(jobId);
 						break;
-					case 'us_tariff_fractions':
-						blob = await api.americanFractionImports.downloadScanErrorsCsv(jobId);
-						break;
 					case 'pedimentos':
 						blob = await api.pedimentosImports.downloadScanErrorsCsv(jobId);
 						break;
diff --git a/frontend/src/lib/components/dashboard/goods/classes/forms/FixedAssetClassForm.svelte b/frontend/src/lib/components/dashboard/goods/classes/forms/FixedAssetClassForm.svelte
index adbf03e1..6c16bed8 100644
--- a/frontend/src/lib/components/dashboard/goods/classes/forms/FixedAssetClassForm.svelte
+++ b/frontend/src/lib/components/dashboard/goods/classes/forms/FixedAssetClassForm.svelte
@@ -14,10 +14,6 @@
 		getTariffFractions,
 		type TariffFraction
 	} from '$lib/api/dashboard/a76/general_catalogs/tariff-fractions';
-	import {
-		getUSTariffFractions,
-		type USTariffFraction
-	} from '$lib/api/dashboard/a76/general_catalogs/us-tariff-fractions';
 	import {
 		getDepreciationCatalog,
 		type DepreciationCatalog
@@ -203,7 +199,7 @@
 		formData.import_tariff_type = (fraction.umt ?? '') as string;
 		showFractionDialog = false;
 	}
-	let usTariffFractions = $state<USTariffFraction[]>([]);
+	let usTariffFractions = $state<TariffFraction[]>([]);
 	let searchUSFraction = $state('');
 	let currentUSPage = $state(1);
 	let totalUSFractions = $state(0);
@@ -392,10 +388,11 @@
 
 		isLoadingUSFractions = true;
 		try {
-			const filters = search ? { search } : {};
+			const filters: Record<string, string> = { catalog: 'american' };
+			if (search?.trim()) filters.search = search.trim();
 			const pageSize = 100;
 
-			const response = await getUSTariffFractions(page, pageSize, companyId, filters);
+			const response = await getTariffFractions(page, pageSize, companyId, filters);
 
 			if (response.data) {
 				if (page === 1) {
@@ -415,10 +412,16 @@
 		}
 	}
 
-	function selectUSFraction(fraction: USTariffFraction) {
-		formData.us_fraction = fraction.code;
-		formData.us_fraction_ad_valorem = fraction.ad_valorem?.toString() || '0.00';
-		formData.us_fraction_fixed_rate = fraction.fixed_cost?.toString() || '0.00000000';
+	function selectUSFraction(fraction: TariffFraction) {
+		formData.us_fraction = fraction.code || '';
+		const advRaw = fraction.adv_impo;
+		let advNum = 0;
+		if (advRaw != null && String(advRaw).trim() !== '') {
+			const n = parseFloat(String(advRaw).replace('%', '').trim());
+			if (!Number.isNaN(n)) advNum = n;
+		}
+		formData.us_fraction_ad_valorem = advNum ? String(advNum) : '0.00';
+		formData.us_fraction_fixed_rate = '0.00000000';
 		// Actualizar tarifa de exportación
 		formData.export_tariff_code = fraction.code || '';
 		formData.export_tariff_type = 'HTS'; // Harmonized Tariff Schedule
@@ -1041,10 +1044,10 @@
 									class="cursor-pointer border-b transition-colors hover:bg-gray-100 dark:hover:bg-gray-700"
 									onclick={() => selectUSFraction(fraction)}
 								>
-									<td class="px-4 py-2 whitespace-nowrap">{fraction.code}</td>
-									<td class="px-4 py-2 whitespace-nowrap">{fraction.prefix || ''}</td>
-									<td class="px-4 py-2 whitespace-nowrap">{fraction.ad_valorem || '0.00'}</td>
-									<td class="px-4 py-2 whitespace-nowrap">{fraction.fixed_cost || '0.00'}</td>
+									<td class="px-4 py-2 whitespace-nowrap">{fraction.fraction || fraction.code}</td>
+									<td class="px-4 py-2 whitespace-nowrap">{fraction.code || '—'}</td>
+									<td class="px-4 py-2 whitespace-nowrap">{fraction.adv_impo ?? '—'}</td>
+									<td class="px-4 py-2 whitespace-nowrap">{fraction.adv_expo ?? '—'}</td>
 									<td class="px-4 py-2">{fraction.description || ''}</td>
 								</tr>
 							{:else}
diff --git a/frontend/src/lib/components/dashboard/goods/modales/us-fraction-selector-dialog.svelte b/frontend/src/lib/components/dashboard/goods/modales/us-fraction-selector-dialog.svelte
index 00ea7d37..99fd1223 100644
--- a/frontend/src/lib/components/dashboard/goods/modales/us-fraction-selector-dialog.svelte
+++ b/frontend/src/lib/components/dashboard/goods/modales/us-fraction-selector-dialog.svelte
@@ -5,7 +5,10 @@
     import * as Table from "$lib/components/ui/table";
     import { toast } from "svelte-sonner";
     import { Search, Loader2, Hash } from "lucide-svelte";
-    import { getUSTariffFractions, type USTariffFraction } from "$lib/api/dashboard/a76/general_catalogs/us-tariff-fractions";
+    import {
+        getTariffFractions,
+        type TariffFraction
+    } from "$lib/api/dashboard/a76/general_catalogs/tariff-fractions";
     import { companyStore } from "$lib/stores/company.svelte";
     import { m } from '$lib/i18n/messages';
 
@@ -15,11 +18,11 @@
         onSelect 
     }: { 
         open: boolean, 
-        onSelect: (item: USTariffFraction) => void 
+        onSelect: (item: TariffFraction) => void 
     } = $props();
 
     // --- ESTADO ---
-    let items = $state<USTariffFraction[]>([]);
+    let items = $state<TariffFraction[]>([]);
     let loading = $state(false);
     let searchTerm = $state("");
     let loadedForCompanyId = $state<number | null>(null);
@@ -30,8 +33,8 @@
         return (code || '').replace(/[.\s-]/g, '');
     }
 
-    function isEligibleAmericanFraction(item: USTariffFraction) {
-        const normalizedCode = normalizeAmericanFractionCode(item.code || '');
+    function isEligibleAmericanFraction(item: TariffFraction) {
+        const normalizedCode = normalizeAmericanFractionCode(item.code || item.fraction || '');
         return /^\d{8}$/.test(normalizedCode) || /^\d{10}$/.test(normalizedCode);
     }
 
@@ -70,7 +73,9 @@
         
         loading = true;
         try {
-            const response = await getUSTariffFractions(1, 1000, companyId);
+            const response = await getTariffFractions(1, 1000, companyId, {
+                catalog: 'american'
+            });
             
             if (response.error) {
                 console.error("Error al cargar fracciones americanas:", response.error);
@@ -97,7 +102,7 @@
         }
     }
 
-    function handleSelect(item: USTariffFraction) {
+    function handleSelect(item: TariffFraction) {
         if (onSelect) onSelect(item);
         open = false;
     }
@@ -150,7 +155,7 @@
                                     <div class="flex items-center gap-2">
                                         <Hash class="h-3 w-3 text-blue-500" />
                                         <span class="font-mono font-bold text-blue-600 dark:text-blue-400">
-                                            {item.code}
+                                            {item.fraction || item.code}
                                         </span>
                                     </div>
                                 </Table.Cell>
diff --git a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/packages-section.svelte b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/packages-section.svelte
index 51111592..b06a6a37 100644
--- a/frontend/src/lib/components/dashboard/invoices/edit/items/fa/packages-section.svelte
+++ b/frontend/src/lib/components/dashboard/invoices/edit/items/fa/packages-section.svelte
@@ -8,6 +8,7 @@
 	import type { Invoice } from '$lib/api/dashboard/a76/invoices';
 	import PackageDialog from './package-dialog.svelte';
 	import USFractionSelectorDialog from '$lib/components/dashboard/goods/modales/us-fraction-selector-dialog.svelte';
+	import type { TariffFraction } from '$lib/api/dashboard/a76/general_catalogs/tariff-fractions';
 	import { m } from '$lib/i18n/messages';
 
     let {
@@ -118,11 +119,12 @@
 		quantities.package_description = pkg.description_es || pkg.description_en || pkg.key;
 	}
 
-	function handleAmericanFractionSelect(fraction: any) {
+	function handleAmericanFractionSelect(fraction: TariffFraction) {
 		customs.american_fraction = fraction.code || '';
 		(customs as any).american_fraction_description = fraction.description || '';
-		if (fraction.ad_valorem !== null && fraction.ad_valorem !== undefined) {
-			customs.advalorem_american = fraction.ad_valorem;
+		if (fraction.adv_impo != null && String(fraction.adv_impo).trim() !== '') {
+			const n = parseFloat(String(fraction.adv_impo).replace('%', '').trim());
+			if (!Number.isNaN(n)) customs.advalorem_american = n;
 		}
 	}
 
diff --git a/frontend/src/lib/components/sidebar/modules.ts b/frontend/src/lib/components/sidebar/modules.ts
index c1b7f0bf..56663f4b 100644
--- a/frontend/src/lib/components/sidebar/modules.ts
+++ b/frontend/src/lib/components/sidebar/modules.ts
@@ -318,10 +318,6 @@ export function getSidebarData(): SidebarData {
 						title: m["sidebar.fractions.sitar_us"](),
 						url: "/dashboard/general_catalogs/tariff-fractions/us",
 					},
-					{
-						title: m["sidebar.fractions.american"](),
-						url: "/dashboard/general_catalogs/tariff-fractions/american",
-					},
 					{
 						title: m["sidebar.fractions.canadian"](),
 						url: "/dashboard/general_catalogs/tariff-fractions/canadian",
diff --git a/frontend/src/lib/config/csv-upload.ts b/frontend/src/lib/config/csv-upload.ts
index 3cc39412..6d1915b0 100644
--- a/frontend/src/lib/config/csv-upload.ts
+++ b/frontend/src/lib/config/csv-upload.ts
@@ -8,7 +8,6 @@ import {
     Plane,
     Package,
     Briefcase,
-    Globe,
     CreditCard,
     DollarSign,
     Calendar,
@@ -227,14 +226,6 @@ export const catalogosConfig: CsvUploadItem[] = [
         templateId: 'exchange_rates',
         layoutModule: 'layouts_csv/exchange_rate'
     },
-    {
-        id: 'american_fractions',
-        title: 'Fracc. Ame.',
-        icon: Globe,
-        modelTarget: 'AmericanFraction',
-        templateId: 'american_fractions',
-        layoutModule: 'layouts_csv/us_tariff_fractions'
-    },
     {
         id: 'material_classes',
         title: 'Clases de Materiales',
diff --git a/frontend/src/lib/csv-import-pending.ts b/frontend/src/lib/csv-import-pending.ts
index fee48340..eb81fd54 100644
--- a/frontend/src/lib/csv-import-pending.ts
+++ b/frontend/src/lib/csv-import-pending.ts
@@ -5,7 +5,6 @@ const VALID_PROFILES: CsvImportProfile[] = [
 	'customs_brokers',
 	'clients_providers',
 	'exchange_rates',
-	'american_fractions',
 	'pedimentos',
 	'material_classes',
 	'vehicles',
diff --git a/frontend/src/lib/csv-import-session.ts b/frontend/src/lib/csv-import-session.ts
index b895ca85..27f7a636 100644
--- a/frontend/src/lib/csv-import-session.ts
+++ b/frontend/src/lib/csv-import-session.ts
@@ -9,7 +9,6 @@ export type CsvImportProfile =
 	| 'customs_brokers'
 	| 'clients_providers'
 	| 'exchange_rates'
-	| 'american_fractions'
 	| 'pedimentos'
 	| 'material_classes'
 	| 'vehicles'
@@ -88,7 +87,6 @@ function isCsvImportProfile(p: unknown): p is CsvImportProfile {
 			'customs_brokers',
 			'clients_providers',
 			'exchange_rates',
-			'american_fractions',
 			'pedimentos',
 			'material_classes',
 			'vehicles',
diff --git a/frontend/src/lib/csv-import-status-api.ts b/frontend/src/lib/csv-import-status-api.ts
index 6dd46f68..ab0ef205 100644
--- a/frontend/src/lib/csv-import-status-api.ts
+++ b/frontend/src/lib/csv-import-status-api.ts
@@ -15,8 +15,6 @@ export function fetchCsvImportStatus(
 			return api.clientProviderImports.status(jobId);
 		case 'exchange_rates':
 			return api.exchangeRateImports.status(jobId);
-		case 'american_fractions':
-			return api.americanFractionImports.status(jobId);
 		case 'pedimentos':
 			return api.pedimentosImports.status(jobId);
 		case 'material_classes':
diff --git a/frontend/src/routes/dashboard/csv-upload/+page.svelte b/frontend/src/routes/dashboard/csv-upload/+page.svelte
index 4fef2855..a00bed73 100644
--- a/frontend/src/routes/dashboard/csv-upload/+page.svelte
+++ b/frontend/src/routes/dashboard/csv-upload/+page.svelte
@@ -195,8 +195,6 @@
 	let useClientProviderImport = $state(false);
 	// Cuando es true, usamos API de importación de Tipos de Cambio (exchange_rate/imports)
 	let useExchangeRateImport = $state(false);
-	// Cuando es true, usamos API de importación de Fracción Americana (us_tariff_fractions/imports)
-	let useAmericanFractionImport = $state(false);
 	// Cuando es true, usamos API de importación de Pedimentos (pedimentos/imports)
 	let usePedimentosImport = $state(false);
 	// Cuando es true, usamos API de importación de Clases de Materiales (classes/imports)
@@ -331,7 +329,6 @@
 		useCustomsBrokerImport = false;
 		useClientProviderImport = false;
 		useExchangeRateImport = false;
-		useAmericanFractionImport = false;
 		usePedimentosImport = false;
 		useMaterialClassesImport = false;
 		useVehicleImport = false;
@@ -355,9 +352,6 @@
 			case 'exchange_rates':
 				useExchangeRateImport = true;
 				break;
-			case 'american_fractions':
-				useAmericanFractionImport = true;
-				break;
 			case 'pedimentos':
 				usePedimentosImport = true;
 				break;
@@ -396,7 +390,6 @@
 		if (useCustomsBrokerImport) return 'customs_brokers';
 		if (useClientProviderImport) return 'clients_providers';
 		if (useExchangeRateImport) return 'exchange_rates';
-		if (useAmericanFractionImport) return 'american_fractions';
 		if (usePedimentosImport) return 'pedimentos';
 		if (useMaterialClassesImport) return 'material_classes';
 		if (useVehicleImport) return 'vehicles';
@@ -608,7 +601,6 @@
 		useCustomsBrokerImport = config.id === 'customs_brokers';
 		useClientProviderImport = config.id === 'clients_providers';
 		useExchangeRateImport = config.id === 'exchange_rates';
-		useAmericanFractionImport = config.id === 'american_fractions';
 		usePedimentosImport = config.id === 'pedimentos';
 		useMaterialClassesImport = config.id === 'material_classes';
 		useVehicleImport = config.id === 'transports';
@@ -688,26 +680,6 @@
 			return;
 		}
 
-		if (useAmericanFractionImport) {
-			try {
-				const res = await api.americanFractionImports.upload(file, companyId, {
-					onUploadProgress: onCsvFileUploadProgress
-				});
-				if (res.data?.job_id) {
-					currentJobId = res.data.job_id;
-					beginCsvScanAfterUpload();
-				} else {
-					toast.error(res.error || 'Error al subir el archivo');
-					isUploading = false;
-				}
-			} catch (e) {
-				console.error('Upload exception', e);
-				toast.error('Error inesperado al subir el archivo');
-				isUploading = false;
-			}
-			return;
-		}
-
 		if (usePedimentosImport) {
 			try {
 				const catalogosSettings = allSettings['catalogos'] || {};
@@ -1299,9 +1271,7 @@
 					? 'clients_providers'
 					: useExchangeRateImport
 						? 'exchange_rate'
-						: useAmericanFractionImport
-							? 'us_tariff_fractions'
-							: usePedimentosImport
+						: usePedimentosImport
 								? 'pedimentos'
 								: useMaterialClassesImport
 									? 'classes'
@@ -1333,9 +1303,7 @@
 						? await api.clientProviderImports.commit(currentJobId)
 						: useExchangeRateImport
 							? await api.exchangeRateImports.commit(currentJobId)
-							: useAmericanFractionImport
-								? await api.americanFractionImports.commit(currentJobId)
-								: usePedimentosImport
+							: usePedimentosImport
 									? await api.pedimentosImports.commit(currentJobId)
 									: useMaterialClassesImport
 										? await api.materialClassImports.commit(currentJobId)
diff --git a/frontend/src/routes/dashboard/general_catalogs/tariff-fractions/american/+page.svelte b/frontend/src/routes/dashboard/general_catalogs/tariff-fractions/american/+page.svelte
deleted file mode 100644
index e34ab3a3..00000000
--- a/frontend/src/routes/dashboard/general_catalogs/tariff-fractions/american/+page.svelte
+++ /dev/null
@@ -1,6 +0,0 @@
-<script lang="ts">
-	import TariffFractionList from '$lib/components/dashboard/goods/fractions/TariffFractionList.svelte';
-	import { m } from '$lib/i18n/messages';
-</script>
-
-<TariffFractionList title={m['sidebar.fractions.american']()} catalog="american" readOnly={false} />
diff --git a/frontend/src/routes/dashboard/general_catalogs/tariff-fractions/american/+page.ts b/frontend/src/routes/dashboard/general_catalogs/tariff-fractions/american/+page.ts
new file mode 100644
index 00000000..b2bd1df9
--- /dev/null
+++ b/frontend/src/routes/dashboard/general_catalogs/tariff-fractions/american/+page.ts
@@ -0,0 +1,7 @@
+import { redirect } from '@sveltejs/kit';
+import type { PageLoad } from './$types';
+
+/** Legacy URL; catalog is unified under SITAR US listing. */
+export const load: PageLoad = () => {
+	throw redirect(308, '/dashboard/general_catalogs/tariff-fractions/us');
+};