During the Product Feed Validation process, we are analyzing your product variants attributed information to make sure they are 100% compliant with Google Merchant Center regulations.
Here are the differences between each tab:
Error: Products NOT ready to publish with one or more errors. Products with errors are not acceptable by Google and will be disapproved by Google if published. Error Products are NOT publishable.
Success: Products ready to publish with no error or warnings.
Warning: Products ready to publish with one or more warnings. Warnings will create a lower SEO rank for your products but you can still publish and run ad campaigns on them.