Sent invoices cannot be edited, so your records match what the client received.
- Correct (void & replace): voids the invoice and creates a replacement draft with the same details for you to fix and send.
- Void: voids the invoice. You must give a reason.
- Cancel draft: cancels an invoice that hasn't been sent yet (Draft or Ready to send). The record is kept as Cancelled; a number already allocated is not reused.
If any payment has been recorded (Paid or Partly paid), first record a refund for the full amount paid. Then you can void or correct the invoice.