This error occurs when your Product ID (for example, UPC, EAN, JAN, and ISBN) corresponds to the Product ID of an existing ASIN, and the MAIN image you’re submitting contradicts the MAIN image that is already present for that particular ASIN.
Error message:
The MAIN image that you have submitted shows a product that is different than the product represented by the ASIN's existing MAIN image. To resolve this problem, remove or update your contribution's MAIN image so that it shows the correct product, or update your contribution's identifying information (for example, UPC or ASIN) so that it corresponds to the product shown in your MAIN image.
If the product image in the Amazon catalog appears to be incorrect, contact Selling Partner Support.