Pop up message on data entry?

[Ninamashr]

I was wondering what would be the easiest way to change an existing field that will pop up a small message when certain data is put into it? For example: I have a "customer name" field that if I ever enter a certain customers name, I would like to have a message pop up say "please do not order material for this customer "

[bcooney]

Well, you could create a calculation field, result text:

If (customerID = "100", "Please do not order material for this customer", "")

and just place this field as a merge field on your layout.

[Ninamashr]

Thank you very much. That worked out great!