Google Merchant Center: Missing MPN
Missing required attribute: mpnWhat's happening
When GTIN is unavailable, Google requires either MPN (Manufacturer Part Number) + brand, or explicit identifier_exists=false. The combination missing-GTIN + missing-MPN + missing-identifier_exists triggers automatic disapproval for branded products.
mpngtinidentifier_existsbrandManual fix
Source the MPN from each manufacturer (typically on the product datasheet or invoice from suppliers), enter it into your CMS, propagate through feed export.
Fix it with Emberfeed
Set identifier_exists with a single field rule: if g:gtin is empty AND g:mpn is empty AND g:brand is set, write g:identifier_exists=false. Google accepts the product. One rule covers every product without an MPN.
Related rejections
Catch every Google Merchant Center issue before they do.
Emberfeed validates your feed against Google Merchant Center's rules in real time. Each issue includes a one-click fix or a clear path to the right rule. Free for 6 months on one feed up to 1,000 products.