Checking existence of a record before adding follow-up info

[Guest]

Try using the on click property of the button, and then
use the dlookup function to check for the existence of the
basic data.

-----Original Message-----
I want to enter a patient's unique ID, which is a

combination of Location and Subject ID, into a form and
click a button to check that the basic data exists for
that patient before adding any of the follow-up
information.