diff --git a/backend/tests/fixtures/builders.py b/backend/tests/fixtures/builders.py
index 2c4e5cbf..d1f0671d 100644
--- a/backend/tests/fixtures/builders.py
+++ b/backend/tests/fixtures/builders.py
@@ -90,6 +90,38 @@ def ensure_tenant_company(db: Session, tenant_id: int = 1, company_id: int = 1)
     return company
 
 
+def _ensure_client_provider_address(
+    db: Session,
+    client: ClientProvider,
+    *,
+    tenant_id: int,
+    company_id: int,
+    country: str,
+) -> None:
+    """
+    Garantiza que el cliente tenga fila de dirección. Si el ORM no tiene `address`
+    cargada pero en BD ya existe (datos previos en CI / DB compartida), reutiliza
+    esa fila en lugar de INSERT duplicado (pkey id = client_id).
+    """
+    if client.address is not None:
+        return
+    existing = (
+        db.query(ClientProviderAddress)
+        .filter(ClientProviderAddress.client_id == client.id)
+        .first()
+    )
+    if existing is not None:
+        client.address = existing
+        return
+    client.address = ClientProviderAddress(
+        id=client.id,
+        client_id=client.id,
+        tenant_id=tenant_id,
+        company_id=company_id,
+        country=country,
+    )
+
+
 def create_business_catalogs(db: Session, tenant_id: int, company_id: int) -> dict:
     provider = (
         db.query(ClientProvider)
@@ -110,14 +142,13 @@ def create_business_catalogs(db: Session, tenant_id: int, company_id: int) -> di
         )
         db.add(provider)
         db.flush()
-    if provider.address is None:
-        provider.address = ClientProviderAddress(
-            id=provider.id,
-            client_id=provider.id,
-            tenant_id=tenant_id,
-            company_id=company_id,
-            country="MEX",
-        )
+    _ensure_client_provider_address(
+        db,
+        provider,
+        tenant_id=tenant_id,
+        company_id=company_id,
+        country="MEX",
+    )
 
     sold_to = (
         db.query(ClientProvider)
@@ -138,14 +169,13 @@ def create_business_catalogs(db: Session, tenant_id: int, company_id: int) -> di
         )
         db.add(sold_to)
         db.flush()
-    if sold_to.address is None:
-        sold_to.address = ClientProviderAddress(
-            id=sold_to.id,
-            client_id=sold_to.id,
-            tenant_id=tenant_id,
-            company_id=company_id,
-            country="USA",
-        )
+    _ensure_client_provider_address(
+        db,
+        sold_to,
+        tenant_id=tenant_id,
+        company_id=company_id,
+        country="USA",
+    )
 
     shipped_to = (
         db.query(ClientProvider)
@@ -166,14 +196,13 @@ def create_business_catalogs(db: Session, tenant_id: int, company_id: int) -> di
         )
         db.add(shipped_to)
         db.flush()
-    if shipped_to.address is None:
-        shipped_to.address = ClientProviderAddress(
-            id=shipped_to.id,
-            client_id=shipped_to.id,
-            tenant_id=tenant_id,
-            company_id=company_id,
-            country="USA",
-        )
+    _ensure_client_provider_address(
+        db,
+        shipped_to,
+        tenant_id=tenant_id,
+        company_id=company_id,
+        country="USA",
+    )
 
     broker = (
         db.query(CustomsBroker)