Block Invoice amount greater than PO amount

Dear Expert,

Currently, I set a tolerance (incoming invoice--> define vendor-specific tolerance) to allow user to post Invoice greater than Amount received (case is PO service for partial receive). However, we want that it will block user to post invoice more then the total value of PO.

Currently, if I set the tolerance limit, then it's possible to post invoice More than PO value as long as the variance is under its tolerance limit.

Any advice?

thanks,

nasikhin