diff --git a/app/services/inventory_service.py b/app/services/inventory_service.py
index 3816c299..91dcb874 100644
--- a/app/services/inventory_service.py
+++ b/app/services/inventory_service.py
@@ -400,8 +400,8 @@ class InventoryService:
                 return ProductInventorySummary(
                     product_id=product_id,
                     vendor_id=vendor_id,
-                    product_sku=product.product_id,
-                    product_title=product.marketplace_product.title,
+                    product_sku=product.vendor_sku,
+                    product_title=product.marketplace_product.get_title() or "",
                     total_quantity=0,
                     total_reserved=0,
                     total_available=0,
@@ -426,7 +426,7 @@ class InventoryService:
                 product_id=product_id,
                 vendor_id=vendor_id,
                 product_sku=product.product_id,
-                product_title=product.marketplace_product.title,
+                product_title=product.marketplace_product.get_title() or "",
                 total_quantity=total_qty,
                 total_reserved=total_reserved,
                 total_available=total_available,
diff --git a/app/services/product_service.py b/app/services/product_service.py
index 3769a4b7..5050031e 100644
--- a/app/services/product_service.py
+++ b/app/services/product_service.py
@@ -80,13 +80,10 @@ class ProductService:
             ValidationException: If marketplace product not found
         """
         try:
-            # Verify marketplace product exists and belongs to vendor
+            # Verify marketplace product exists
             marketplace_product = (
                 db.query(MarketplaceProduct)
-                .filter(
-                    MarketplaceProduct.id == product_data.marketplace_product_id,
-                    MarketplaceProduct.vendor_id == vendor_id,
-                )
+                .filter(MarketplaceProduct.id == product_data.marketplace_product_id)
                 .first()
             )
 
@@ -113,7 +110,7 @@ class ProductService:
             product = Product(
                 vendor_id=vendor_id,
                 marketplace_product_id=product_data.marketplace_product_id,
-                product_id=product_data.product_id,
+                vendor_sku=product_data.vendor_sku,
                 price=product_data.price,
                 sale_price=product_data.sale_price,
                 currency=product_data.currency,
diff --git a/app/services/vendor_service.py b/app/services/vendor_service.py
index ded91a8b..42bdf1a6 100644
--- a/app/services/vendor_service.py
+++ b/app/services/vendor_service.py
@@ -453,7 +453,7 @@ class VendorService:
                     vendor.vendor_code, product.marketplace_product_id
                 )
 
-            # Create vendor -product association
+            # Create vendor-product association
             new_product = Product(
                 vendor_id=vendor.id,
                 marketplace_product_id=marketplace_product.id,
diff --git a/models/schema/product.py b/models/schema/product.py
index 548932f9..9f433d77 100644
--- a/models/schema/product.py
+++ b/models/schema/product.py
@@ -11,7 +11,7 @@ class ProductCreate(BaseModel):
     marketplace_product_id: int = Field(
         ..., description="MarketplaceProduct ID to add to vendor catalog"
     )
-    product_id: str | None = Field(None, description="Vendor's internal SKU/product ID")
+    vendor_sku: str | None = Field(None, description="Vendor's internal SKU")
     price: float | None = Field(None, ge=0)
     sale_price: float | None = Field(None, ge=0)
     currency: str | None = None
@@ -23,7 +23,7 @@ class ProductCreate(BaseModel):
 
 
 class ProductUpdate(BaseModel):
-    product_id: str | None = None
+    vendor_sku: str | None = None
     price: float | None = Field(None, ge=0)
     sale_price: float | None = Field(None, ge=0)
     currency: str | None = None
@@ -41,7 +41,7 @@ class ProductResponse(BaseModel):
     id: int
     vendor_id: int
     marketplace_product: MarketplaceProductResponse
-    product_id: str | None
+    vendor_sku: str | None
     price: float | None
     sale_price: float | None
     currency: str | None