We have received a payment which we attributed to the wrong invoice. how do we correct it?

Hello Philippe4, you can click into the received payment itself rather than the invoice and go to more on the black banner at the bottom and >delete. This will remove it from that invoice. If you have matched in banking you can before deleting the payment in the top left click on online banking in the blue writing and remove the match so you can then rematch it to the correct invoice.