Sometimes, it’s necessary to invalidate an invoice. When an invoice has been posted, this also means derived administrations have been updated, such as inventory for the items on the invoice.
To undo the effects of an invoice, i.e. to reduce the amount outstanding with a customer, use the VOID button on the invoice screen as shown in @@@figref . This creates a new invoice by the same number as the original, except that the new invoice has a suffix -VOID.