On other marketplaces or shopping carts, the unique product identifier is the product id or product sku.
Within eBay, the unique product identifier is the 'Custom Label' field and need to be populated by the user (i.e. ebay does not automatically assign a 'custom label' for each listing.
Additionally, if you have the same exact product on two or more listing, Finale will need an unique "custom label" for each of each listing for Finale to properly be able to manage the inventory and/or push accurate stock quantities for both listings.
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