Hi,
My customer has partially paid a manual advance customer invoice.
I deducted the amount already paid from the customer's final invoice via the “advance invoice” screen.
My customer has paid the remainder of the invoice, so the final invoice is settled with an open amount in the customer's account on the advance invoice.
When I try to cancel the balance of the advance invoice using a cancellation code in screen “mixed payment”, the system displays the following message: “prepayment type is mandatory when paying an advance invoice.”
What should I do?
Thank you for your help