The supplier's EAN/UPC code of the product

retann_Required
Yes
retann_Examples
 <itemReference registry="Supplier" coding="EAN13">7313492579392</itemReference> 
retann_Xpath
/b24Message/returnAnnouncement/item/itemReference[@registry="Supplier" and @coding="barcodeType"]
retann_Sort
9100
retann_Id
82
retann_Type
Number