What is the difference between the purchase_receipt and dme_purchase_receipt either API or TAB? We recently installed DME in our APP9 version and are having issues with receiving some type 6 POs. In register PO arrivals screen, Error Message: Field RECEIPT_NO] is mandatory for Dme Purchase Receipt and requires a value. Receipt No is assigned by IFS at the time of receipt so we cannot receive some PO’s but the majority are received with no error.