diff --git a/app/services/inventory_service.py b/app/services/inventory_service.py
index 91dcb874..fce5fb29 100644
--- a/app/services/inventory_service.py
+++ b/app/services/inventory_service.py
@@ -425,7 +425,7 @@ class InventoryService:
             return ProductInventorySummary(
                 product_id=product_id,
                 vendor_id=vendor_id,
-                product_sku=product.product_id,
+                product_sku=product.vendor_sku,
                 product_title=product.marketplace_product.get_title() or "",
                 total_quantity=total_qty,
                 total_reserved=total_reserved,
diff --git a/tests/unit/services/test_inventory_service.py b/tests/unit/services/test_inventory_service.py
index 2af7ff11..a152fd5e 100644
--- a/tests/unit/services/test_inventory_service.py
+++ b/tests/unit/services/test_inventory_service.py
@@ -368,15 +368,24 @@ class TestInventoryService:
         # Create a new product without inventory
         from models.database.product import Product
         from models.database.marketplace_product import MarketplaceProduct
+        from models.database.marketplace_product_translation import MarketplaceProductTranslation
 
         unique_id = str(uuid.uuid4())[:8]
         mp = MarketplaceProduct(
             marketplace_product_id=f"MP_EMPTY_{unique_id}",
-            title="Product Without Inventory",
             price="29.99",
             marketplace="Letzshop",
         )
         db.add(mp)
+        db.flush()
+
+        # Create translation for the product (title is now in translations table)
+        translation = MarketplaceProductTranslation(
+            marketplace_product_id=mp.id,
+            language="en",
+            title="Product Without Inventory",
+        )
+        db.add(translation)
         db.commit()
 
         product = Product(