Thanks for reply, but it doesn't work, still the same error. I know that I can pass that values from a spreadsheet but I wan't to do it directly in one place, on Shopify products

Nope. There is no extra content here like spaces. Also - error is not related to Certification number but whole field.

Hello,I've such a problem:- I've defined Variant meta-field mm-google-shopping.certification, with single line text type- I've filled in correct values in that field, in format Google require: EC:EPREL:XXXXX (certificationAuthority, certificationName...