Match in Full with Tax on Invoice and no Tax on PO

Summary

How to streamline the match in full process when tax isn't calculated on PO

Content

Our current setup has no tax calculation at the time of purchase order, and tax is calculated when invoice is created. With the match in full process, invoice is created and matched to the PO for the total amount. Since tax is calculated when that match in full invoice is created, the invoice is put on line variance hold.

For customer not calculating tax at the time of PO, how do you get around this issue and not have every invoice that is tax eligible getting put on hold?