Receipting Exceptions for Amount Only POs

Hello, the below scenario is something we have seen in our business and would like advice on how we can get vouchers to a matched status.

Scenario:

Amount only purchase Order for £1000 is raised. Multiple vouchers are raised and associated to the PO totalling £1005.

The business allows a 10% / £10 tolerance to accommodate such scenarios, so matching tolerances are applied on the POs for over/under pricing.

The purchase order has been fully receipted.

When the last voucher is ran through matching, the pricing tolerances are allowing the voucher to match however the RULE_R600 match exception is flagged as there is a £5 shortfall between the receipt and voucher.