When listing products on Amazon, providing accurate Product IDs is essential. This is how Amazon determines if there is already an existing ASIN/ISBN in their catalog or if you can create new ones for your items.
Recently, M2E Pro made an improvement allowing you to specify Product IDs for Amazon under Configuration > Settings > Main. 
However, there are times when you still need to specify the Product ID at the Listing level. For example, if you sell the same product under different brands on different marketplaces. In this case, your product will most likely have several UPC/EAN codes and may be listed under multiple ASINs.
Here is a workaround that fits a business strategy like this.
In the Catalog > Products, assign your Magento product the proper 'UPC/EAN' attribute for each Magento Store View you’re going to list the product on. Then, create a Listing for each of these Store Views and add your product there.
M2E Pro will use the UPC/EAN value specified for the particular Store View and seamlessly sync it with Amazon.
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