Product ID and SKU ID Mismatch

The offer feed references a Product ID that doesn't match the SKU's existing item record. The two identifiers must align before the offer can attach.

Walmart Seller Center uses identifiers (GTIN, MPN, brand, SKU) to match catalog records. Issues come from invalid format (non-numeric in a GTIN field), brand-GTIN mismatches in GS1's database, duplicate IDs across SKUs, or missing required identifiers for the category.

1. Verify GTIN ownership using GS1 GEPIR (https://gepir.gs1.org) — confirms which brand legitimately owns the code.
2. Strip non-numeric characters from GTINs: no dashes, no letters, no spaces.
3. Check ID lengths: UPC = 12 digits, EAN-13 = 13 digits, ISBN-13 = 13 digits starting 978/979.
4. If your product is private-label without a real GTIN, request the channel's GTIN exemption process rather than fabricating one.
5. Re-submit; new identifiers take 24–72 hours to propagate.

• Buying GTINs from non-GS1 resellers — usually maps to defunct brands and triggers validation
• Reusing the same GTIN across multipack and single-unit variants — flagged as duplicate