Other reasons for whether you can't cancel an invoice are as follows :  You applied a prepayment on the invoice  Canceling the invoice reduces the billed amount less than zero On partially paid invoices, you can create a memo and then reconcile it with the invoice to turn this invoice into a fully-paid invoice.
The invoice is:  Fully or partially paid  On hold  Selected for payment  Matched to a purchase order with a status of Finally closed  Already canceled  Corrected by a credit or debit memo
00691
I can't cancel an invoice.