Can you change Tax Rate Areas do not Match warning to a hard error ?

We had a situation where a po was raised with a line level tax rate area. The AP voucher was unfortunately entered with a different tax rate area. A warning was issued by the system in P4314, but the user chose to ignore it and created an out of balance batch that would not post. I thought I had in the past seen such mistakes hit a hard error but I cannot find where the validation is set up. Would like this to result in a hard error in future.