Problem with "you need to add a GTIN or MPN"

Start a Business

Topic summary

Sellers are encountering Google Shopping feed rejections requiring GTIN (Global Trade Item Number) or MPN (Manufacturer Part Number) identifiers, even when products are marked as “custom” in Shopify.

Core Issue:

  • Google requires unique product identifiers to approve listings
  • Custom/handmade products typically lack these standardized codes
  • Even with “custom” designation, Google may still reject products it recognizes from other sellers

Available Solutions:

For Custom Products:

  • Set identifier_exists field to false under Products > More Actions > Google Shopping
  • Request a GTIN exemption directly from Google Merchant Center
  • Contact Google Support to verify handmade/unique product status

For Standard Products:

  • Purchase official GTINs/barcodes from GS1 (each variant needs its own code)
  • Use manufacturer-provided codes when available
  • For bundles, use the GTIN from one component product

Variant Display Problem:
Multiple users report that despite setting item_group_id correctly, Google shows individual variants separately rather than grouped under parent products. This appears to be a Google algorithm decision that sellers cannot directly control—contacting Google Support is recommended for specific cases.

Additional Requirements:
Apparel/accessories categories require: size, color, condition, age group, and gender attributes. The Bulk Product Editor app can streamline adding these fields across multiple products.

Dropshipping Note:
AliExpress products typically don’t include GTINs—sellers must purchase codes separately or apply for exemptions.

Summarized with AI on November 23. AI used: claude-sonnet-4-5-20250929.
18

Hey @CLKNC ,

That’s interesting that sometimes the bundles are accepted and sometimes they are not. Have you come across any notable difference between the products that are accepted?

According to the article linked below, if you are selling a multipack or bundle, use the GTIN of ONE of the products: