How can I change or edit the UPC number of a product already created in the Amazon listing by another seller? Here I explain my situation. I want to add a product that is black, when I write the UPC it tells me that it does not exist but the product already has a photo and is published as black on Amazon with the UPC of the product being blue. When I try to add the blue product, the black product appears. What should I do to correct this problem?
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