diff --git a/backend/alembic/versions/7937209f9718_seed_initial_data.py b/backend/alembic/versions/7937209f9718_seed_initial_data.py
index 1a4f86ed..7b7d0105 100644
--- a/backend/alembic/versions/7937209f9718_seed_initial_data.py
+++ b/backend/alembic/versions/7937209f9718_seed_initial_data.py
@@ -528,7 +528,7 @@ def upgrade() -> None:
     )
 
     if values_historical_fractions:
-        op.execute("ALTER TABLE a76.historical_tariff_fractions DISABLE TRIGGER ALL;")
+        op.execute("SET session_replication_role = replica;")
         op.execute(
             f"""
             INSERT INTO a76.historical_tariff_fractions 
@@ -540,7 +540,7 @@ def upgrade() -> None:
             ON CONFLICT DO NOTHING;
         """
         )
-        op.execute("ALTER TABLE a76.historical_tariff_fractions ENABLE TRIGGER ALL;")
+        op.execute("SET session_replication_role = DEFAULT;")
 
 
 def downgrade() -> None:
diff --git a/backend/api/v1/modules/a76/items/imports/temporary/validators/calculations.py b/backend/api/v1/modules/a76/items/imports/temporary/validators/calculations.py
new file mode 100644
index 00000000..7bc9c5af
--- /dev/null
+++ b/backend/api/v1/modules/a76/items/imports/temporary/validators/calculations.py
@@ -0,0 +1,79 @@
+from sqlalchemy.orm import Session
+from api.v1.modules.a76.invoices.models import InvoiceFinancials, InvoiceHeader, InvoiceLogistics
+from core.exceptions import ErrorCollector
+
+from ....models import LineItem
+from ....line_financials.models import LineFinancial
+from ....line_financials.schemas import LineFinancialCreate
+from ....line_quantities.models import LineQuantity
+from ....line_quantities.schemas import LineQuantityCreate
+from ....line_customs.models import LineCustom
+from ....line_customs.schemas import LineCustomCreate
+from ....line_descriptions.models import LineDescription
+from ....line_descriptions.schemas import LineDescriptionCreate
+from ....line_references.models import LineReference
+from api.v1.modules.a24.fa.fa_item_lines.models import FaLineItem
+from ....models import LineItem
+from api.v1.modules.a76.classes.models import Class
+
+
+def apply_calculations(
+    db: Session, line: LineItem, tenant_id: int, company_id: int, line_number: int
+):
+    #TODO: SSisGen Logic 
+    # if ssisgen.calcularcostounitarioenbaseavalortotalscaf = 1:
+    #   unit_cost_capture = line.financial.total_value / line.financial.total_value <-- habria que revisar por que esta asi, por que para mi no tiene sentido, pero es lo que esta en clarion
+    caluclate_values(db, line, tenant_id, company_id)
+    
+    if not line.fa_data.is_subitem:
+        line.fa_data.subitem_number = None
+        
+    invoice_date = db.query(InvoiceHeader.invoice_date).filter(InvoiceHeader.id == line.invoice_id, InvoiceHeader.tenant_id == tenant_id, InvoiceHeader.company_id == company_id).scalar()
+        
+    line.depreciation_date = invoice_date
+    
+    if (not line.description.description_spanish and not line.description.description_english) and (line.part_info.description_spanish and line.part_info.description_english):
+        line.description.description_spanish = line.part_info.description_spanish
+        line.description.description_english = line.part_info.description_english
+    else:
+        if not line.description.description_spanish:
+            class_desc = (
+                db.query(Class.description_es, Class.description_en)
+                .filter(Class.id == line.class_id, Class.tenant_id == tenant_id, Class.company_id == company_id)
+                .first()
+            )
+            if class_desc:
+                line.description.description_spanish, line.description.description_english = class_desc
+            
+
+def caluclate_values(
+    db: Session, line: LineItem, tenant_id: int, company_id: int
+):
+    result = (
+        db.query(InvoiceFinancials.currency, InvoiceFinancials.exchange_rate)
+        .filter(InvoiceFinancials.invoice_id == line.invoice_id, InvoiceFinancials.tenant_id == tenant_id, InvoiceFinancials.company_id == company_id)
+        .first()
+    )
+    if not result:
+        return
+
+    currency, exchange_rate = result
+
+    if currency == "foreign":
+        line.financial.unit_cost_usd = line.financial.unit_cost_capture
+        line.financial.value_usd = line.financial.unit_cost_usd * line.quantity.quantity
+        line.financial.unit_cost_mxn = line.financial.unit_cost_capture * exchange_rate
+        line.financial.value_mxn = line.financial.unit_cost_mxn * line.quantity.quantity
+        line.financial.value_mc = line.financial.unit_cost_usd * line.quantity.quantity
+    elif currency == "local":
+        line.financial.unit_cost_mxn = line.financial.unit_cost_capture
+        line.financial.value_mxn = line.financial.unit_cost_mxn * line.quantity.quantity
+        line.financial.unit_cost_usd = line.financial.unit_cost_capture / exchange_rate
+        line.financial.value_usd = line.financial.unit_cost_usd * line.quantity.quantity
+        line.financial.value_mc = line.financial.unit_cost_usd * line.quantity.quantity
+    elif currency == "manual":
+        line.financial.unit_cost_usd = line.financial.unit_cost_capture/exchange_rate
+        line.financial.value_usd = line.financial.unit_cost_usd * line.quantity.quantity
+        line.financial.unit_cost_mxn = line.financial.unit_cost_usd * exchange_rate
+        line.financial.value_mxn = line.financial.unit_cost_mxn * line.quantity.quantity
+        line.financial.value_mc = line.financial.unit_cost_capture * line.quantity.quantity
\ No newline at end of file