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Why this issue is happening
Two or more of your products share the same brand [brand] and MPN [mpn], but have a differing value for the item group ID [item_group_ID] attribute. As a result, the product data in Merchant Center is inconsistent.
How to fix your issue
Provide a consistent item group ID [item_group_ID] for all products with the same brand [brand] and MPN [mpn].
Fix products one by one directly in Merchant Center
Navigate to Products in Merchant Center, then select the Needs attention tab.
Use the filter icon
above the table to find all products affected by your issue.
Click on the title of the product you want to fix, then click Edit product.
Provide a consistent item group ID
[item_group_ID] for all products with the same brand [brand] and MPN [mpn].
Select Save.
Fix multiple products at once
Navigate to Products in Merchant Center, then select the Needs attention tab.
Use the filter icon
above the table to find all products affected by your issue.
Select the download icon
to download a list (.csv) of all affected products for all issues or this particular issue.
Cross reference the downloaded list with your uploaded product data, and provide a consistent item group ID
[item_group_ID] for all products with the same brand [brand] and MPN [mpn].
Reupload your corrected product data to Merchant Center using your chosen upload method.
Next steps
After making the requested changes, check that you’ve fixed the issue by making sure it’s no longer listed on the “Needs attention” page.
Keep in mind: It may take some time for your change to be reflected on the “Needs attention” page.