A. UPDATE is sent in the Header and CREATE in the Detail for an existing Purchase Order line. The application will add up the corresponding "Order Quantity".

B. Purchase order can be re-created by sending the RE-CREATE action code when the status is In- Receiving.

C. The Purchase order header can be updated by sending an UPDATE action code when the status is in Created and Received.

D. UPDATE is sent both in the Header and Detail for an existing line. The application will just update the record at Details.

E. The RE-CREATE action code if sent for an existing PO, the same PO will be deleted and re-created with the new details.