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In this help center, you can find content for both Merchant Center Next and the classic Merchant Center experience. Look for the logo at the top of each article to make sure you're using the article for the Merchant Center version that applies to you. 

Changes to enforcement for the MPN [mpn] attribute

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The Manufacturer Part Number (MPN) is a unique product identifier that is used to identify a specific product among all of the products produced by a manufacturer. Customers may search for a product using a specific MPN, so providing the MPN can help ensure that your product is shown in relevant situations.

Starting in August of 2021, item-level warnings for "Incorrect product identifier [mpn]" will be issued on the Diagnostics page of your Merchant Center account. These warnings are intended to notify you that you’ve submitted an incorrect value for the MPN [mpn] attribute for one or more of the products listed in your product data.

Beginning in September of 2021, the products for which you received warnings will be disapproved. Review your Diagnostics page to see if your products are affected, and either provide a valid MPN value or clear the current incorrect value in your product data. Learn more about how to fix incorrect MPN

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