The Product with SKU [%s] may be identical to existing ASINs ([%s]) based on these attributes: [%s]. For details, see http://sellercentral.amazon.co.uk/gp/help/17791
This error occurs when the product data you provided closely resembles the existing product data for one or more products in the Amazon catalogue. The error message specifies the similar products by providing an ASIN and the similar item attributes.
Whenever possible, Amazon presents customers with a single page for a product, regardless of how many sellers offer the product. Therefore, you must provide enough product data for Amazon to determine if your product matches an existing product or if it is a new, unique product.
Follow these steps to resolve this error: