3 way match to a different supplier

Summary

3 way match to a different supplier

Content

We have several instances when we match AP invoices to POs where the PO has a different supplier than the supplier that actually sends the invoice.  Invoice imaging is matching on the PO and subsequently matching to the PO (and its supplier) and paying the invoice to the supplier on the PO instead of this invoice being paid to the supplier that send the invoice.  I have advised the business to update the PO, but AP is looking for a way to identify these instances.  Does anyone have a good solution for this?