Are you having some issues when adding your barcodes to your products with your Amazon seller central account?
If you get the following error message similar to “You are using EANs codes that do not match the products you are trying to list.” This is normally an Amazon error.
It's because Amazon believes that the product that you are trying to list already exists in their catalogue. They want all listings of the same product to be on the same listing, to promote price competition. This may be best for Amazon, but undoubtedly isn’t the best option for you as a seller.
So to add your product as a new product, and a unique listing, you simply need to differentiate your product to enable it to be listed. Let's say your seller name on Amazon is Wesell2you. End your product title “supplied by Wesell2you”. Also under manufacturer enter it as “Wesell2you”.
Should you encounter any other errors when creating new products please let us know.