diff --git a/backend/api/v1/modules/a24/fa/fa_item_lines/models.py b/backend/api/v1/modules/a24/fa/fa_item_lines/models.py
new file mode 100644
index 00000000..5aa2d038
--- /dev/null
+++ b/backend/api/v1/modules/a24/fa/fa_item_lines/models.py
@@ -0,0 +1,34 @@
+from typing import Optional
+from sqlalchemy import Boolean, ForeignKey, Integer, String
+from sqlalchemy.orm import Mapped, mapped_column
+from core.database import Base
+
+class LineItem(Base):
+    __tablename__ = "line_items"
+    __table_args__ = (
+        {"schema": "a24"}
+    )
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    item_id: Mapped[int] = mapped_column(ForeignKey("a76.items.id"))
+    
+    # Asset information (SCAF specific)
+    asset_number: Mapped[Optional[str]] = mapped_column(String(25))  # ASSETNUMBER
+    asset_photo: Mapped[Optional[str]] = mapped_column(String(255))  # FOTOACTIVOFIJO
+    equipment_message: Mapped[Optional[str]] = mapped_column(String(40))  # EQI_MENSAJE    
+    invoice_type_asset: Mapped[Optional[str]] = mapped_column(String(6))  # TIPOFACTURAASSET
+    return_import_invoice: Mapped[Optional[str]] = mapped_column(String(15))  # FACTURAIMPORET
+    return_import_date: Mapped[Optional[int]] = mapped_column(Integer)  # FECHAFACIMPORET
+    movement_type_import: Mapped[Optional[str]] = mapped_column(String(3))  # TIPOMOVIMPO
+    
+    # Cross-references IN CASE OF IMPORT REPAIR
+    search_invoice: Mapped[Optional[str]] = mapped_column(String(15))  # FACTURAEXPO (when line is import) / FACTURAIMPO (when line is export)
+    search_line: Mapped[Optional[int]] = mapped_column(Integer)  # LINEAEXPO (when line is import) / LINEAIMPO (when line is export)
+    
+    # Search type
+    search_type: Mapped[Optional[str]] = mapped_column(String(10))  # TIPOBUSQUEDA
+    
+    # Special flags    
+    download: Mapped[Optional[bool]] = mapped_column(Boolean)  # DESCARGA    
+    own_equipment: Mapped[Optional[bool]] = mapped_column(Boolean)  # EQUIPOPROPIO
+    omit_annex31: Mapped[Optional[bool]] = mapped_column(Boolean)  # OMITITENANEXO31
\ No newline at end of file
diff --git a/backend/api/v1/modules/a76/items/models.py b/backend/api/v1/modules/a76/items/models.py
new file mode 100644
index 00000000..1439f6a0
--- /dev/null
+++ b/backend/api/v1/modules/a76/items/models.py
@@ -0,0 +1,620 @@
+"""
+Normalized Database Schema for SCAF (Fixed Assets) and SCAII (Parts Inventory)
+SQLAlchemy v2 - Annex 24 Compliance
+"""
+
+from datetime import datetime
+from decimal import Decimal
+from typing import Optional, TYPE_CHECKING
+from enum import Enum
+from sqlalchemy import Boolean, String, Integer, Numeric, Text, SmallInteger, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from core.database import Base
+
+if TYPE_CHECKING:
+    from .series.models import Serie
+
+# ============================================================================
+# CORE ENTITIES
+# ============================================================================
+
+class Item(Base):
+    """
+    Unified item header table for all import/export operations
+    Consolidates headers from both SCAF and SCAII systems
+    """
+    __tablename__ = "items"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    invoice_id: Mapped[int] = mapped_column(ForeignKey("a76.invoice_header.id"))  # CONSECUTIVO
+    item_type: Mapped[str] = mapped_column(String(20))  # Type: IMPORT_TEMP, IMPORT_DEF, EXPORT, REPAIR, etc.
+    system_origin: Mapped[str] = mapped_column(String(10))  # SCAF or SCAII
+    
+    # Item references
+    invoice_number: Mapped[Optional[str]] = mapped_column(String(15))  # FACTURAIMPO/FACTURAEXPO
+    reference_number: Mapped[Optional[str]] = mapped_column(String(20))  # NUMREFERENCIA
+    order: Mapped[Optional[str]] = mapped_column(String(50))  # ORDENCOMPRA / ORDENVENTA
+    guide_number: Mapped[Optional[str]] = mapped_column(String(50))  # NUMEROGUIA/NUMERODEGUIA
+    
+    # Dates
+    invoice_date: Mapped[Optional[int]] = mapped_column(Integer)  # FECHAFACTURA
+    depreciation_date: Mapped[Optional[int]] = mapped_column(Integer)  # FECHADEPRECIACION
+    
+    # Administrative fields
+    rectification: Mapped[Optional[int]] = mapped_column(SmallInteger)  # RECTIFICACION
+    warehouse: Mapped[Optional[str]] = mapped_column(String(30))  # BODEGA
+    location: Mapped[Optional[str]] = mapped_column(String(200))  # LOCALIZACION
+    
+    # Relationships
+    lines: Mapped[list["LineItem"]] = relationship(back_populates="item", cascade="all, delete-orphan")
+
+
+class LineItem(Base):
+    """
+    Unified line items for all items
+    Consolidates all line-level data from Q and S tables
+    """
+    __tablename__ = "item_lines"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    item_id: Mapped[int] = mapped_column(ForeignKey("a76.items.id"))
+    line_number: Mapped[int] = mapped_column(Integer)  # LINEAIMPO/LINEAEXPO/LINEA
+    
+    # Part identification
+    part_number: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.parts.id"))  # NUMPARTE
+    component_part_number: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.parts.id"))  # NUMPARTECOM
+    class_code: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.classes.id"))  # CLASE
+            
+    # Unit of measure
+    unit_of_measure: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.units_of_measure_general.id"))  # UNIDADMEDIDA/UNIMED
+    alternate_unit: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.units_of_measure_general.id"))  # UNIMEDALTERNA
+    uma_key: Mapped[Optional[str]] = mapped_column(String(2))  # CLAVEUMA
+    auxiliary_unit: Mapped[Optional[str]] = mapped_column(String(5))  # UNIMEDAUXILIAR                               
+    
+    # Permits and certificates
+    permit_number: Mapped[Optional[str]] = mapped_column(String(20))  # NUMPERMISO
+    page_line: Mapped[Optional[str]] = mapped_column(String(10))  # PAGRENGLON
+    has_certificate: Mapped[Optional[bool]] = mapped_column(Boolean)  # TIENECO/CERTORIGEN
+    certificate_number: Mapped[Optional[str]] = mapped_column(String(10))  # NOCERTIFICADO
+    octave_permit: Mapped[Optional[str]] = mapped_column(String(20))  # PERMISOROCTAVA
+    permits_ped: Mapped[Optional[str]] = mapped_column(String(500))  # PERMISOSPED
+    
+    # FDA
+    has_fda_code: Mapped[Optional[bool]] = mapped_column(Boolean)  # LLEVACODFDA
+    fda_key: Mapped[Optional[str]] = mapped_column(String(10))  # CLAVEFDA
+    
+    # Subitem flags
+    is_subitem: Mapped[Optional[bool]] = mapped_column(Boolean)  # ESSUBPARTIDA
+    contains_subitems: Mapped[Optional[bool]] = mapped_column(Boolean)  # CONTIENESUBP
+    includes_subitems: Mapped[Optional[bool]] = mapped_column(Boolean)  # INCUYESUBPARTIDAS
+    subitem_number: Mapped[Optional[bool]] = mapped_column(Boolean)  # SUBPARTIDA
+    
+    # Special flags     
+    is_military_mcia: Mapped[Optional[bool]] = mapped_column(Boolean)  # ESMCIAMILITAR
+            
+    # IV32 (Tax identification)
+    iv32_type_key: Mapped[Optional[str]] = mapped_column(String(5))  # CLAVETIPOIV32
+    iv32_number: Mapped[Optional[str]] = mapped_column(String(35))  # NUMEROIV32
+    
+    
+    
+    # IN CASE OF EXPO
+    scrap_invoice: Mapped[Optional[str]] = mapped_column(String(15))  # FACTURASCRAP
+    consecutive_destination: Mapped[Optional[int]] = mapped_column(Integer)  # CONSECUTIVODES    
+    ctm_section: Mapped[Optional[str]] = mapped_column(String(3))  # APARTADOCTM
+    
+    # Tax payment
+    tax_payment: Mapped[Optional[bool]] = mapped_column(Boolean)  # PAGOIMPUESTO
+    payment_method: Mapped[Optional[str]] = mapped_column(String(9))  # FORMAPAGO/FORMAPAGOTIGI
+    igi_amount: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # MONTOIGI
+    igi_payment_method: Mapped[Optional[str]] = mapped_column(String(9))  # FORMAPAGOTIGI               
+    
+    # FCC
+    fcc_key: Mapped[Optional[str]] = mapped_column(String(30))  # CLAVEFCC
+    
+    # Valuation method
+    valuation_method: Mapped[Optional[str]] = mapped_column(String(2))  # METVALOR
+    valuation_determined_value: Mapped[Optional[Decimal]] = mapped_column(Numeric(29, 8))  # METVALORVALORDETERMINADO/METVALORACIONVALORDETERMINADO
+    valuation_reason: Mapped[Optional[str]] = mapped_column(String(500))  # METVALORMOTIVODEUSO/METVALORACIONMOTIVODEUSO        
+    
+    # Container rules
+    container_rule: Mapped[Optional[str]] = mapped_column(String(50))  # CONTENEDORREGLA
+    container_parts_ii: Mapped[Optional[str]] = mapped_column(String(50))  # CONTENEDORPARTESII
+    
+    # APHIS
+    consecutive_aphis: Mapped[Optional[int]] = mapped_column(Integer)  # CONSECUTIVOAPHIS           
+    
+    # BOM/Commercial
+    bom_version: Mapped[Optional[int]] = mapped_column(Integer)  # VERSIONBOM
+    bill_version: Mapped[Optional[int]] = mapped_column(Integer)  # VERSIONBILL
+    
+    # TLCAN value
+    tlcan_value: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORTLCAN
+            
+    # Identifier
+    identifier: Mapped[Optional[str]] = mapped_column(String(2))  # IDENTIFICADOR
+    
+    # Validation fields
+    validation_zero: Mapped[Optional[int]] = mapped_column(Integer)  # VALIDACIONZERO
+    validation_one: Mapped[Optional[int]] = mapped_column(Integer)  # VALIDACIONUNO
+    
+    # Material type
+    material_type: Mapped[Optional[str]] = mapped_column(String(50))  # TIPOMAT/TIPODENUMPARTE
+    
+    # Order concept
+    order_type: Mapped[Optional[str]] = mapped_column(String(50))  # TIPODEORDEN
+    line_concept: Mapped[Optional[str]] = mapped_column(String(50))  # CONCEPTODELAPARTIDA
+    
+    # Review dispatch
+    review_dispatch: Mapped[Optional[str]] = mapped_column(String(10))  # REVISARDESP
+    
+    # Take component from PT
+    take_component_pt: Mapped[Optional[int]] = mapped_column(Integer)  # TOMARCOMOPT
+    
+    # Pallet
+    pallet2: Mapped[Optional[int]] = mapped_column(SmallInteger)  # PALLET2
+    
+    # Wildcard field
+    wildcard_field: Mapped[Optional[str]] = mapped_column(String(100))  # CAMPOCOMODIN
+    
+    # Relationships
+    item: Mapped["Item"] = relationship(back_populates="lines")
+    
+class LineFinancial(Base):
+    """
+    Financial details for line items
+    Consolidates all line-level data from Q and S tables
+    """
+    __tablename__ = "line_financials"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    item_line_id: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))
+
+    # Costs - Capture
+    unit_cost_capture: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUNITARIOCAPTURA
+    
+    # Costs - USD
+    unit_cost_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUNITARIODLLS/COSTOUNITARIOME
+    unit_cost_commercial_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUCOMDLLS
+    unit_cost_current_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOACTUALDLLS
+    unit_cost_depreciated_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTODEPRECME
+    unit_cost_subitem_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUNITARIOSUBPDLLS
+    unit_cost_auxiliary_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUAUXILIARME
+    sales_cost_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOVENTAME
+    commercial_unit_cost: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUNICOMERCIAL
+    
+    # Costs - MXN
+    unit_cost_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUNITARIOPESOS/COSTOUNITARIOMN
+    unit_cost_commercial_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUCOMPESOS
+    unit_cost_current_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOACTUALMN
+    unit_cost_depreciated_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTODEPRECMN
+    unit_cost_subitem_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOUNITARIOSUBPPESOS
+    sales_cost_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # COSTOVENTAMN
+    
+    # Costs - MC (Custom Currency)
+    unit_cost_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(29, 8))  # COSTOUNITARIOMC
+    
+    # Values - MXN
+    value_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORMN/VALORIMPOMN/VALOREXPOMN
+    value_commercial_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALOREXPOCOMMN
+    value_updated_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORACTUALIZADOMN
+    value_subitem_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORSUBPMN
+    sub_import_value_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # SUBVALORIMPOMN
+    value_returned_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORRETORNADOMN
+    value_depreciated_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORDEPRECIADOMN
+    customs_value_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORADUANASMN
+    value_total_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORTOTALMN
+    value_temp_material_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORMPTEMPMN
+    value_def_material_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORMPDEFMN
+    value_added_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORAGREMN
+    value_national_packing_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALEMPAQUENACMN
+    vat_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # IVAIMPOMN/IVAEXPOMN/VALORIVAMN
+    vat_used_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORIVAMNUSADO
+    advalorem_line_mxn: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # ADVALORMNLINEAPED
+    
+    # Values - USD
+    value_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(29, 8))  # VALORME/VALORIMPOME/VALOREXPOME
+    value_commercial_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALOREXPOCOMME
+    value_updated_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORACTUALIZADOME
+    value_subitem_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORSUBPME
+    sub_import_value_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # SUBVALORIMPOME
+    value_returned_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORRETORNADOME
+    value_depreciated_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORDEPRECIADOME
+    customs_value_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORADUANASME
+    value_auxiliary_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORIMPOAUXILIARME / VALOREXPORAUXILIARME
+    value_total_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORTOTALME
+    value_temp_material_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORMPTEMPME
+    value_def_material_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORMPDEFME
+    value_added_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORAGREME
+    value_national_packing_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALEMPAQUENACME
+    value_us_packing_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALEMPAQUEUSME
+    vat_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # IVAIMPOME/IVAEXPOME/VALORIVAME
+    vat_used_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORIVAMEUSADO
+    value_non_originating_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORNOORIGINARIOME
+    value_originating_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORORIGINARIOME
+    igi_amount_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # MONTOIGIME
+    exempt_amount_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # MONTOEXCENTOME
+    total_commercial_value: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORTOTALCOMERCIAL
+    advalorem_line_usd: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # ADVALORMELINEAPED
+    
+    # Values - MC
+    value_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(29, 8))  # VALORIMPOMC/VALOREXPOMC
+    sub_import_value_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # SUBVALORIMPOMC
+    vat_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # IVAIMPOMC/IVAEXPOMC
+    value_added_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORAGREMC
+    value_national_packing_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALEMPAQUENACMC
+    value_total_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORTOTALMC
+    value_temp_material_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORMPTEMPMC
+    value_def_material_mc: Mapped[Optional[Decimal]] = mapped_column(Numeric(23, 8))  # VALORMPDEFMC
+    
+    # Relationship
+    item_line: Mapped["LineItem"] = relationship()
+
+class LineQuantity(Base):
+    """
+    Quantity details for line items
+    Consolidates all line-level data from Q and S tables
+    """
+    __tablename__ = "line_quantities"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    item_line_id: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))
+    
+    # Quantities
+    quantity: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # CANTIMPO / CANTEXPO / CANTIMPODEF
+    alternate_quantity: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # CANTALTERNA
+    quantity_uma: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # CANTIMPOUMA / CANTEXPOUMA
+    auxiliary_quantity: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # CANTIMPOAUXILIAR / CANTEXPOAUXILIAR
+    
+    # Quantities - Special (SCAF specific)
+    quantity_temp_export: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # CANTEXPOTEMP
+    quantity_existence: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # CANTEXISTENCIA
+    quantity_returned: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # CANTRETORNADA
+    quantity_returned_temp: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # CANTRETORNADATEMP
+    serial_count: Mapped[Optional[int]] = mapped_column(Integer)  # CANT_SERIES/CANT_SERIESDEF
+    
+    # Weight
+    weight_unit: Mapped[Optional[str]] = mapped_column(String(3))  # 'KG' o 'LB'
+    net_weight: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # PESONETO
+    gross_weight: Mapped[Optional[Decimal]] = mapped_column(Numeric(19, 8))  # PESOBRUTO    
+    
+    # Packaging
+    package_key: Mapped[Optional[str]] = mapped_column(String(5))  # CLAVEBULTOS
+    package_quantity: Mapped[Optional[int]] = mapped_column(Integer)  # CANTBULTOS
+    package_description: Mapped[Optional[str]] = mapped_column(String(40))  # DESCBULTOS
+    container_quantity: Mapped[Optional[int]] = mapped_column(SmallInteger)  # CANTBULCONT
+    container_description: Mapped[Optional[str]] = mapped_column(String(40))  # DESCCONTENEDOR
+    box_count: Mapped[Optional[str]] = mapped_column(String(30))  # NOCAJAS
+    
+    # Relationship
+    item_line: Mapped["LineItem"] = relationship()
+
+class LineCustoms(Base):
+    """
+    Customs details for line items
+    Consolidates all line-level data from Q and S tables
+    """
+    __tablename__ = "line_customs"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    item_line_id: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))
+    
+    # Tariff/Customs Classifications
+    fraction: Mapped[Optional[str]] = mapped_column(String(10))  # FRACCION / FRACCIONIMPO / FRACCIONEXPO
+    fraction_type: Mapped[Optional[str]] = mapped_column(String(7))  # TIPOFRACCION / TIPOFRACCIONIMPO / TIPOFRACCIONEXPO
+    american_fraction: Mapped[Optional[str]] = mapped_column(String(16))  # FRACCIONAMERICANA
+    alternate_fraction: Mapped[Optional[str]] = mapped_column(String(10))  # FRACCIONALTERNA
+    reference_fraction: Mapped[Optional[str]] = mapped_column(String(10))  # FRACCIONREFERENCIA
+    octave_fraction: Mapped[Optional[str]] = mapped_column(String(10))  # FRACCIONROCTAVA
+    tlcan_fraction: Mapped[Optional[str]] = mapped_column(String(13))  # FRACCIONTLCAN
+    extra_american_fraction: Mapped[Optional[str]] = mapped_column(String(16))  # FRACAMESELEXTRA
+    garment_fraction: Mapped[Optional[str]] = mapped_column(String(19))  # FRACCIONDELAPRENDA/FRACCIONDELAPARTIDA
+    
+    # Ad Valorem
+    advalorem: Mapped[Optional[str]] = mapped_column(String(10))  # ADVIMPO / ADVEXPO
+    advalorem_numeric: Mapped[Optional[Decimal]] = mapped_column(Numeric(7, 2))  # ADVIMPONUM / ADVEXPONUM
+    advalorem_american: Mapped[Optional[Decimal]] = mapped_column(Numeric(5, 2))  # ADVAME 
+    advalorem_tlcan: Mapped[Optional[Decimal]] = mapped_column(Numeric(5, 2))  # ADVTLCAN
+    
+    # Rates
+    rate: Mapped[Optional[str]] = mapped_column(String(10))  # TASAIM / TASAEX
+    depreciation_rate: Mapped[Optional[Decimal]] = mapped_column(Numeric(5, 2))  # TASADEPRECIA
+    
+    # Origin/Destination
+    origin_country: Mapped[Optional[str]] = mapped_column(String(3))  # PAISORIGEN
+    destination_country: Mapped[Optional[str]] = mapped_column(String(3))  # PAISDESTINO
+    optional_country: Mapped[Optional[str]] = mapped_column(String(3))  # PAISOPCIONAL
+    origin_procedure: Mapped[Optional[str]] = mapped_column(String(3))  # PROCEDENCIA
+    scrap_procedure: Mapped[Optional[str]] = mapped_column(String(3))  # PROCSCRAP
+    
+    # Sector
+    sector: Mapped[Optional[str]] = mapped_column(String(8))  # SECTOR
+    
+    # Relationship
+    item_line: Mapped["LineItem"] = relationship()
+   
+class LineDescription(Base):
+    """
+    Description details for line items
+    Consolidates all line-level data from Q and S tables
+    """
+    __tablename__ = "line_descriptions"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    item_line_id: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))
+    
+    # Descriptions
+    description_spanish: Mapped[Optional[str]] = mapped_column(String(4999))  # DESCRIPCIONE
+    description_english: Mapped[Optional[str]] = mapped_column(String(4999))  # DESCRIPCIONI
+    extra_description: Mapped[Optional[str]] = mapped_column(Text)  # DESCRIPCIONEEXTRA
+    part_description: Mapped[Optional[str]] = mapped_column(String(500))  # DESCRIPCIONPARTE
+    class_description: Mapped[Optional[str]] = mapped_column(String(500))  # DESCRIPCIONCLASE                
+    
+    # Product attributes
+    brand: Mapped[Optional[str]] = mapped_column(String(50))  # MARCA
+    model: Mapped[Optional[str]] = mapped_column(String(50))  # MODELO
+    has_serial: Mapped[Optional[bool]] = mapped_column(Boolean)  # LLEVASERIE
+    
+    # Additional information
+    additional_info_spanish: Mapped[Optional[str]] = mapped_column(String(1000))  # INFOADICIONESP
+    additional_info_english: Mapped[Optional[str]] = mapped_column(String(1000))  # INFOADICIONING
+    
+    # Lot and entry tracking
+    lot: Mapped[Optional[str]] = mapped_column(String(254))  # LOTE
+    entry_number: Mapped[Optional[str]] = mapped_column(String(50))  # NUMENTRADA/NUMERODEENTRADA
+    
+    # Relationship
+    item_line: Mapped["LineItem"] = relationship()
+
+class LineReference(Base):
+    """
+    Reference details for line items
+    Consolidates all line-level data from Q and S tables
+    """
+    __tablename__ = "line_references"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    item_line_id: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))
+      
+    serie_id: Mapped[Optional[int]] = mapped_column(ForeignKey("a76.item_line_series.id"))  # SERIEPARTIDA  
+      
+    # Customer/Vendor
+    customer_invoice: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.clients_and_providers.id"))  # CLIENTEFACTURAR
+    assigned_client: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.clients_and_providers.id"))  # CLIENTEASIGNADO
+    supplier: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.clients_and_providers.id"))  # PROVEEDOR
+    requisitioner: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.clients_and_providers.id"))  # REQUISITOR
+    sent_to: Mapped[Optional[str]] = mapped_column(ForeignKey("a76.clients_and_providers.id"))  # ENVIADOA
+    
+    # PED line reference
+    ped_line: Mapped[Optional[int]] = mapped_column(Integer)  # LINEAPED
+    ro_line: Mapped[Optional[int]] = mapped_column(Integer)  # LINEARO
+    
+    # Relationship
+    item_line: Mapped["LineItem"] = relationship()
+
+# ============================================================================
+# SUPPORTING TABLES
+# ============================================================================
+
+class PackingList(Base):
+    """
+    Packing list items
+    From: SPartidasPackingList
+    """
+    __tablename__ = "packing_lists"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)    
+    item_line_id: Mapped[int] = mapped_column(Integer)  # LINEA
+    packing_list_number: Mapped[Optional[str]] = mapped_column(String(100))  # NUMPACKINGLIST
+
+
+class RepairPart(Base):
+    """
+    Repair parts (orphan table without primary key in original)
+    From: SPartidasRep
+    """
+    __tablename__ = "repair_parts"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)    
+    import_line: Mapped[int] = mapped_column(Integer)  # LINEAIMPO        
+
+
+class CTMShipment(Base):
+    """
+    CTM Shipment lines (temporary manufacturing)
+    From: SPartidasEnviaCTM
+    """
+    __tablename__ = "ctm_shipments"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)    
+    shipment_line: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))  # LINEAENVIO    
+    brand: Mapped[Optional[str]] = mapped_column(String(50))  # MARCA
+    model: Mapped[Optional[str]] = mapped_column(String(50))  # MODELO
+    serial_numbers: Mapped[Optional[str]] = mapped_column(String(50))  # SERIES
+
+
+class CTMReceipt(Base):
+    """
+    CTM Receipt lines (temporary manufacturing)
+    From: SPartidasReciboCTM
+    """
+    __tablename__ = "ctm_receipts"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)    
+    receipt_line: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))  # LINEARECIBO            
+    
+    option: Mapped[Optional[str]] = mapped_column(String(3))  # OPCION
+    exit_invoice: Mapped[Optional[str]] = mapped_column(String(19))  # FACTURASALIDA
+
+
+class SubassemblyEntry(Base):
+    """
+    Subassembly/Submanufacturing Entry lines
+    From: SPartidasEntradaSM
+    """
+    __tablename__ = "subassembly_entries"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    remission_line: Mapped[int] = mapped_column(Integer)  # LINEAREMISION
+    exit_invoice: Mapped[Optional[str]] = mapped_column(String(15))  # FACTURASALIDA
+    exit_line: Mapped[Optional[int]] = mapped_column(Integer)  # LINEASALIDA        
+
+
+class SubassemblyExit(Base):
+    """
+    Subassembly/Submanufacturing Exit lines
+    From: SPartidasSalidaSM
+    """
+    __tablename__ = "subassembly_exits"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)    
+    exit_line: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))  # LINEASALIDA    
+
+
+class ImpositionPart(Base):
+    """
+    Imposition parts (orphan table without primary key constraint)
+    From: SPartidasImposion
+    """
+    __tablename__ = "imposition_parts"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)        
+    import_line: Mapped[int] = mapped_column(Integer)  # LINEAIMPO          
+
+
+
+# ============================================================================
+# INDEXES AND CONSTRAINTS
+# ============================================================================
+
+"""
+Recommended indexes for optimal query performance:
+
+CREATE INDEX idx_items_consecutive ON items(consecutive);
+CREATE INDEX idx_items_invoice ON items(invoice_number);
+CREATE INDEX idx_items_type_system ON items(item_type, system_origin);
+CREATE INDEX idx_items_dates ON items(invoice_date, depreciation_date);
+
+CREATE INDEX idx_lines_item ON item_lines(item_id);
+CREATE INDEX idx_lines_part ON item_lines(part_number);
+CREATE INDEX idx_lines_class ON item_lines(class_code);
+CREATE INDEX idx_lines_invoice_refs ON item_lines(import_invoice, export_invoice);
+CREATE INDEX idx_lines_fractions ON item_lines(import_fraction, export_fraction);
+
+CREATE INDEX idx_packing_consecutive ON packing_lists(consecutive);
+CREATE INDEX idx_packing_part ON packing_lists(part_number);
+
+CREATE INDEX idx_repair_invoice ON repair_parts(import_invoice, import_line);
+CREATE INDEX idx_ctm_ship_consec ON ctm_shipments(consecutive);
+CREATE INDEX idx_ctm_rcpt_consec ON ctm_receipts(consecutive);
+CREATE INDEX idx_sub_entry_consec ON subassembly_entries(consecutive);
+CREATE INDEX idx_sub_exit_consec ON subassembly_exits(consecutive);
+CREATE INDEX idx_imposition_consec ON imposition_parts(consecutive);
+"""
+
+
+# ============================================================================
+# MIGRATION NOTES
+# ============================================================================
+
+"""
+MIGRATION STRATEGY FROM ORIGINAL TABLES TO NORMALIZED SCHEMA:
+
+1. DOCUMENT MAPPING:
+   - QEqeMaq (Equipment Import Temp) → items (type='EQUIPMENT_IMPORT_TEMP', system='SCAF')
+   - QEqeMaqRep (Equipment Repair Export) → items (type='EQUIPMENT_REPAIR_EXPORT', system='SCAF')
+   - QEqiDef (Equipment Import Definitive) → items (type='EQUIPMENT_IMPORT_DEF', system='SCAF')
+   - QEqiMaq (Equipment Machinery) → items (type='EQUIPMENT_MACHINERY', system='SCAF')
+   - QEqiMaqRep (Equipment Machinery Repair) → items (type='EQUIPMENT_REPAIR_IMPORT', system='SCAF')
+   - SPartidasCM (Common Commerce) → items (type='COMMON_COMMERCE', system='SCAII')
+   - SPartidasExpo (Export) → items (type='EXPORT', system='SCAII')
+   - SPartidasImpo (Import) → items (type='IMPORT', system='SCAII')
+
+2. LINE MAPPING:
+   All line items from Q* and SPartidas* tables map to item_lines with appropriate
+   field mapping based on the original column names (preserved as comments).
+
+3. FIELD CONSOLIDATION RULES:
+   - Costs: Unified under unit_cost_* with currency suffix (usd/mxn/mc)
+   - Values: Unified under value_* with currency suffix
+   - Quantities: Unified under quantity_* with specific purpose suffixes
+   - Descriptions: Consolidated into description_spanish/english/extra
+   - Fractions: All fraction fields preserved with clear naming
+   
+4. DATA INTEGRITY:
+   - Original CONSECUTIVO + LINE number preserved for traceability
+   - Foreign key relationships established via item_id
+   - All original fields retained to prevent data loss
+   
+5. SPECIAL TABLES:
+   - PackingList, RepairPart, CTM*, Subassembly*, ImpositionPart remain separate
+     as they serve specific purposes and don't fit the main item/line pattern
+
+6. BENEFITS:
+   - Eliminates redundancy across 13 original tables
+   - Unified query interface for all operations
+   - Maintains full audit trail with original field names
+   - Enables cross-system reporting (SCAF + SCAII)
+   - Simplifies maintenance with single schema
+   
+7. QUERYING EXAMPLES:
+   ```python
+   # Get all imports (both systems)
+   session.query(Item).filter(
+       Item.item_type.in_(['IMPORT', 'EQUIPMENT_IMPORT_TEMP', 'EQUIPMENT_IMPORT_DEF'])
+   )
+   
+   # Get all lines for a specific part across all items
+   session.query(LineItem).filter(
+       LineItem.part_number == 'ABC123'
+   )
+   
+   # Get SCAF equipment with depreciation
+   session.query(Item).join(LineItem).filter(
+       Item.system_origin == 'SCAF',
+       LineItem.value_depreciated_usd.isnot(None)
+   )
+   ```
+"""
\ No newline at end of file
diff --git a/backend/api/v1/modules/a76/items/series/models.py b/backend/api/v1/modules/a76/items/series/models.py
new file mode 100644
index 00000000..a944b080
--- /dev/null
+++ b/backend/api/v1/modules/a76/items/series/models.py
@@ -0,0 +1,23 @@
+from typing import Optional
+from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, Numeric, String
+from sqlalchemy.orm import Mapped, mapped_column
+from core.database import Base
+
+class Serie(Base):
+    __tablename__ = "item_line_series"
+    __table_args__ = {
+        "schema": "a76",
+    }
+    
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    line_item_id: Mapped[int] = mapped_column(ForeignKey("a76.item_lines.id"))  # LINEAIMPO / LINEAEXPO
+    row: Mapped[int] = mapped_column(Integer)  # RENGLON
+    serial_numbers: Mapped[Optional[str]] = mapped_column(String(50))  # SERIEEXPO
+    model: Mapped[Optional[str]] = mapped_column(String(50))  # MODELOEXPO
+    sub_model: Mapped[Optional[str]] = mapped_column(String(50))  # SUBMODELOEXPO
+    brand: Mapped[Optional[str]] = mapped_column(String(50))  # MARCA
+    expo_brad: Mapped[Optional[str]] = mapped_column(String(50))  # MARCAEXPO
+    number_id: Mapped[Optional[str]] = mapped_column(String(25))  # NUMIDEXPO
+        
+    
+    
\ No newline at end of file
diff --git a/backend/api/v1/modules/a76/parts/models.py b/backend/api/v1/modules/a76/parts/models.py
index a536d897..12750dca 100644
--- a/backend/api/v1/modules/a76/parts/models.py
+++ b/backend/api/v1/modules/a76/parts/models.py
@@ -9,12 +9,10 @@ from typing import TYPE_CHECKING, Optional
 from api.v1.common.base_models import TenantScopedMixin, TimestampMixin
 from core.database import Base
 from sqlalchemy import (
-    ForeignKey,
     ForeignKeyConstraint,
     Integer,
     Numeric,
     PrimaryKeyConstraint,
-    SmallInteger,
     String,
     UniqueConstraint,
     Boolean,
@@ -57,7 +55,7 @@ class Part(Base, TenantScopedMixin, TimestampMixin):
 
     # Unique constraint compuesta
     client_id: Mapped[int] = mapped_column(Integer)
-    part_number: Mapped[str] = mapped_column(String(49))
+    part_number: Mapped[str] = mapped_column(String(50))
 
     # Basic information
     fraction: Mapped[Optional[str]] = mapped_column(String(10))
diff --git a/backend/main.py b/backend/main.py
index 197a111b..0959a83d 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -16,6 +16,9 @@ from core.middleware import (
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
+from api.v1.modules.a76.items.models import Item # Importar rutas para registrar con el router
+from api.v1.modules.a76.items.series.models import Serie   # Importar modelos para registrar con SQLAlchemy
+
 # Configurar logging
 logging.basicConfig(
     level=logging.INFO if not settings.DEBUG else logging.DEBUG,
diff --git a/docker-compose.yml b/docker-compose.yml
index 6d4d1ffb..18215907 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,14 +1,13 @@
 services:
   # PostgreSQL - Base de datos core (app)
   postgres-a76:
-    image: postgres:16-alpine
+    image: postgres:18-alpine
     container_name: anexo76-postgres-a76
     environment:
       POSTGRES_DB: anexo76_core
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: ${POSTGRES_APP_PASSWORD:-postgres}
       POSTGRES_INITDB_ARGS: "--encoding=UTF8"
-      PGDATA: /var/lib/postgresql/data/pgdata
     ports:
       - "5432:5432"
     volumes:
@@ -38,14 +37,13 @@ services:
 
   # PostgreSQL - Base de datos Keycloak
   postgres-keycloak:
-    image: postgres:16-alpine
+    image: postgres:18-alpine
     container_name: anexo76-postgres-keycloak
     environment:
       POSTGRES_DB: keycloak
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: ${POSTGRES_KEYCLOAK_PASSWORD:-postgres}
       POSTGRES_INITDB_ARGS: "--encoding=UTF8"
-      PGDATA: /var/lib/postgresql/data/pgdata
     ports:
       - "5433:5432"
     volumes: