Merchant Center doesnt accept Products because of GTIN

Hey There,

after i’ve created succesfully me feed i transfered it to the Google Merchant Center.
Unfortunately the GTIN number doesnt exist in my feed and for that reason the Merchant Center won’t accept my Products in the Feed.

It Workes for single products but it doesnt work for variable Products.

Do you have any idea how to fix this?

Thanks For Helping me out.