UPC 豁免externally_assigned_product_identifier 怎么填

UPC 豁免商品在用listings/2021-08-01/items/ 接口 创建时，UPC 豁免的信息字段：externally_assigned_product_identifier 怎么填；

如果不填会返回：{"code":200,"data":{"submissionId":"14ec4a523cf74ba88a731f6965c7e5d6","sku":"HOW1252A@#7848-JY","issues":[{"severity":"ERROR","code":"90220","attributeNames":["merchant_suggested_asin"],"categories":["MISSING_ATTRIBUTE"],"message":"'Merchant Suggested ASIN' is required but not supplied."},{"severity":"ERROR","code":"90220","attributeNames":["externally_assigned_product_identifier"],"categories":["MISSING_ATTRIBUTE"],"message":"'External Product ID' is required but not supplied."}],"status":"INVALID"},"message":"OK"}；

如果填空的，也会报错：{"severity":"ERROR","code":"8572","categories":["INVALID_ATTRIBUTE"],"message":"The product ID (ASIN, UPC, EAN, ISBN, or JAN) you provided doesn't match our brand records. Verify you're using the correct manufacturer-assigned barcode. If you recently purchased a GTIN/UPC from GS1, wait 72 hours before resubmitting. If you are certain of using a correct product ID, contact Selling Partner Support with product images showing the barcode and brand, your GS1 certificate, and brand authorization documents.","sku":"HOW1586B@#8937-EO"}；确认了是UPC豁免的，那externally_assigned_product_identifier 这个字段怎么填。

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