changing identifier to false for google shopping ?

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Hi there :)

So I am using the google shopping app through shopify however i am currently getting a message on google merchant center stating Limited performance due to missing identifiers (gtin, mpn, brand).  My products are custom made and i have set them as custom made in shopifys app however i spoke to google and they said that my identifier states that it exists and says yes next to it, where as it needs to say no or false, so this needs to be changed, however google said i need to do this in shopify ?

anybody have any ideas how to change the identifier so that it states false please ?

i have already made sure all my products in the google field are set to custom.