Product without GTIN disapproved
We are now trying to update our product list with a XML feed, but continuously get an error said "Item requires a GTIN". Since our product are custom ones, we provided mpn instead then still get this error. And we also tried to provide "identifier_exists" as "no" and still get the same. Now 97% of our products are disapproved for about one week. Please advise how to get them approve for adwords. Thanks.