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Reasons why the issue is happening
One or more of your products has a missing {store_code} placeholder Valuetrack parameter in your link template [link_template] and or mobile link template [mobile_link_template]. When using vehicle ads with in-shop fulfilment or local inventory ads with the shop-specific product page with in-store availability and price feature, you must provide the {store_code} ValueTrack parameter to your link template [link_template] and mobile link template [mobile_link_template] if you're using it.
How to fix the issue
Fix products one by one directly in Merchant Center
Go to Products in the 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 that you want to fix, then click Edit product.
Filter the downloaded report so that you only view products with:
'Issue title' = Missing [store_code] ValueTrack parameter in link template [link_template] and mobile link template [mobile_link_template]
Update those products' data to ensure link template [link_template] and mobile link template [mobile_link_template] have {store_code} ValueTrack parameter.
Select Save.
Fix multiple products at once
Go to Products in the 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.
Filter the downloaded report so that you only view products with:
'Issue title' = Missing [store_code] ValueTrack parameter in link template [link_template] and mobile link template [mobile_link_template]
Update those products' data to ensure link template [link_template] and mobile link template [mobile_link_template] have {store_code} ValueTrack parameter.
Re-upload your corrected product data to Merchant Center using your chosen upload method.