Assigning an Invoice to a payment that has been VAT posted

Hi,
Im trying to assigning an Invoice to a payment that has been VAT posted. Unfortunately, within the Bank tab the option is grayed out and within the Sales tab if I select the invoice and make a payment, it creates a new entry. This then shows as a second payment.

Any advice?

Regards.

When you click the green “Tagged” button to view that VAT posted payment on the bank, what appears in the narrative? Is simply posted to a client account, or has it already been attached to an invoice?

If it’s the former then that payment should exist as credit on account so you should then be able to locate the invoice you want to pay down, click “Log a payment” and select pay from credit.