Prior (old) outstanding PO message at Invoice Match

Hi all,

May we have alert/note message at the time of PO matching if user matches the PO which is made later (with respect to) any already existing PO?

Let there are two POs (PO_1 made on 13-AUG-14 & PO_2 on 14-AUG-14) with same supplier & item. Receiving is also done & both POs are available for billing.

Now AP user matches invoice with PO_2 (instead of PO_1 which is made first/prior). Here at this point we need an alert/note message to prompt that a prior/old PO (PO_1) is available to match. This we need at the time of selection of later/newer PO (PO_2) from the LOV available on Match Window.