P0411 Match Voucher to Open Receipt - how can I increase the 'Amount to Voucher' when supplier vouch

I wonder if you can advise me on this please?

We have a three-line purchase order to voucher match, but the supplier invoice total is for £1.92 more than the original Purchase Order.

This is partly owing to rounding (supplier uses 3 decimal places instead of our 2) but mostly because the supplier converted the original order into Euros and has then converted it back into GBP at the time of invoicing, and the currency exchange rate fluctuation has caused that increase in amount.

In such cases where the Supplier Voucher is for a slightly different value to the original Purchase Order, the user usually simply over-types the 'Amount to Voucher' value on the last order line, to ensure the total on the receipt matches the total on the voucher to match.