Error 21919420: For multiple-variation listings, GTIN values are specified at the variation level.

For multiple-variation listings, all GTIN values should be specified through the VariationProductListingDetails.EAN field, the VariationProductListingDetails.ISBN field, or the VariationProductListingDetails.UPC field. GTIN values should be different for each variation in a listing.

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Error 21919420: For multiple-variation listings, GTIN values are specified at the variation level. | ebay FAQ | Hustle Got Real