I have had the same customer pay the same invoice 3 times.
The first payment was matched to the initial invoice.
The 2nd invoice was also matched using the "Closed invoices" option and thus created a credit.
Now when I try and allocate the 3rd payment via the Bank Feed "Receive Payment" option and select "Closed Invoices" tab that invoice number doesn't come up as there is a CREDIT balance against it.
How can I allocate this further overpayment?