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How to solve - Limited performance due to missing value error [GTIN] in Google Merchant Center?

My merchant center account is showing an error - Limited performance due to missing value gtin. How can I solve this?

It is always a good idea to have the correct format of GTIN allowed in the sale area.

You can also leave the GTIN field empty if you do not have one. If the GTIN field is empty, AdNabu will send the GTIN as a null value, ensuring your products are not disapproved because of GTIN.

Some products are only shown in ads by Google if they have accurate GTINs. To solve this error, kindly update the Barcode field of the product in Shopify.