How do I cancel a bill?

Quick answerIn 3 steps

Only on the same day, and before that month's GST return is marked filed. After that, give a credit note instead.
Back office: Sales → Invoices → open the bill → “Cancel invoice”, with a reason (owner or manager).
At the counter: Ctrl+P → find the bill → Cancel, with a reason; a cashier needs a manager's PIN. The stock goes back on the shelf.

Ctrl+PThe keyPress it at the counter

WhereSales → Invoices in the back office

Learn it properlyCancel a bill the same day with a reasonSame day only, before the month is filed — otherwise a credit note.Open the lesson →

Also asked as

“void an invoice”
“wrong bill made”