In my test, ON ERROR did trigger for a field validation error. You can also try with a TRY-CATCH.

>Is there a way to CATCH the field validation error in the VFP front end?
>
>For Example : my validation rule for field "QTY" is QTY>0
>
>Message "Qty cannot be 0"
>
>What i am looking is to trap the above validation error in my application. "On Error" is unable to trap the database validation errors.