Updating a purchase order Use this procedure to update a purchase order on the Select PO to Receive window. Click the drill down icon on a PO line. Specify this information: Quantity Received Optionally, specify the quantity that was received. Unit Optionally, specify the unit. Qty Unavailable Optionally, specify the quantity that is not available. Unavailable Reason If you specified a quantity in the Qty Unavailable field, you can update the reason in this field. Cancel Optionally, select this check box to update the receiving status to Cancel. Click Save.