Write off invoice
From Protemos Wiki
On this page, you can write-off the invoice.
Write off is the unpaid part of the invoice that you are not expecting to be paid in the future,
so you may want to mark the invoice as fully paid by adding a write off:
E.g. you invoiced the client for 2420 EUR but got 2400 EUR because of the bank charges,
and for some reason, you are not going to ask the client to pay 20 EUR difference.
