>Put a command to check the cust_no in the database on lost focus event of the control and prompt a message if not unique.

Thanks Marc. I tried that with the following code in the Lost Focus event:

seek this.value
if foun()
retu .f.
else
retu .t.
endi

And I entered a cust_no that's already in use and got the same message: "Uniquness of index CUST_NO is violated."

This really oughta be simple. In fact, I'm sure it IS for all of you. :) I just don't know what I'm not seeing here...