We are looking at using Purchase Order Authorization Rules to require our Commodity Managers to review and approve changes made by Buyer to POs.  I set the rule and the PO requires requires authorization before initial release and it requires a change order to raise the price on the PO.  However, if I have a change order pending approval, the PO can be received and matched at the old price with no warning of any kind that there is a pending change order.  Is there a way to stop the receipt or matching if a change order is pending?