Se esta disenando mejor la parte de partes

backend/api/v1/modules/a76/items/line_items/models.py

@@ -1,6 +1,6 @@
 from decimal import Decimal
 from typing import Optional, TYPE_CHECKING
-from sqlalchemy import Boolean, String, Integer, Numeric, SmallInteger, ForeignKey
+from sqlalchemy import Boolean, String, Integer, Numeric, SmallInteger, ForeignKey, ForeignKeyConstraint
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from api.v1.common.base_models import TenantScopedMixin, TimestampMixin
 from core.database import Base
@@ -25,9 +25,14 @@ class LineItem(Base, TenantScopedMixin, TimestampMixin):
     """
 
     __tablename__ = "item_lines"
-    __table_args__ = {
-        "schema": "a76",
-    }
+    __table_args__ = (
+        ForeignKeyConstraint(
+            ["class_code", "tenant_id", "company_id"],
+            ["a76.classes.class_code", "a76.classes.tenant_id", "a76.classes.company_id"],
+            name="fk_item_lines_class"
+        ),
+        {"schema": "a76"},
+    )
 
     id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
     item_id: Mapped[int] = mapped_column(ForeignKey("a76.items.id"))
@@ -40,9 +45,7 @@ class LineItem(Base, TenantScopedMixin, TimestampMixin):
     component_part_number: Mapped[Optional[str]] = mapped_column(
         ForeignKey("a76.parts.id")
     )  # NUMPARTECOM
-    class_code: Mapped[Optional[str]] = mapped_column(
-        ForeignKey("a76.classes.class_code")
-    )  # CLASE
+    class_code: Mapped[Optional[str]] = mapped_column(String(8))  # CLASE
 
     # Unit of measure
     unit_of_measure: Mapped[Optional[str]] = mapped_column(