Why can't I void this invoice?
What you'll do: An invoice can only be voided while it is Issued, has never been marked as sent, and has no payments. Once it's been sent to the customer or has any payment, void is gone for good.
What you see
Invoice has been marked as sent; void is not permitted (use Credit Note for corrections)
or
Invoice has recorded payments; void is not permitted (use Credit Note for corrections)
Why
An issued invoice is a legal GST document, so it's immutable. The only in-app way to cancel a mistaken one is to void it — and that's only allowed before it has left your hands (never sent) and before any money is recorded against it.
What you can do
- If it qualifies (issued, never sent, unpaid): open the invoice and use Void Invoice. The dispatch is freed so you can generate a corrected invoice.
- If it's already been sent or paid: there is no correction path in this version. The messages point to Credit Notes, but Credit Notes aren't available yet — see Can I issue a credit note?. Handle the correction with the customer directly (for example a fresh invoice for the difference, per your accountant's guidance).