Mistaken payment to supplier

I made a payment to a supplier in error. Some days later I noticed the error and the supplier refunded that payment. How should I represent this in Clearbooks?

Do I need to create two fake invoices (one payment and one refund)? Or is there maybe some way I can write-off an unallocated payment against an unallocated receipt and remove them both from the "Unallocated cash" page.