Custom Message if Parameter Value Not Found

[pjmatelli]

Hi All,
I am looking for a way to create a custom message to use when a user enters a value in a parameter box that simply doesn't exist.

e.g. I have a parameter looking for a PO#. if the PO# is found, a form opens with that PO#. If the user types an incorrect PO# (doesn't exist), I would like a message to come up saying that the PO does not exist.

I can't seem to figure this one out. Any help, as always, is greatly appreciated!

TIA

 

[Erick]

Thanks again Joe4, you are definitely helping get over my access-o-phobia