How to 'reverse' Invoice Price Variance generated from a Matched PO?

Hi,

I have matched an invoice with a PO. The PO Price was £1 and when I matched the invoice I changed the price to £2

As a result a Invoice Price Variance was generated.

What happen if after doing this the user realised that was a mistake and that it should have matched the PO to the invoice for £1? How can I correct this matching and 'reverse' the invoice price variance that in this scenario is not correct?

Thanks,

cv