How to correct an issued invoice with a credit note

An approved invoice is not edited or deleted. Make a credit note from it: the lines come across, you choose what to credit and say why.

Checked against the product on 2026-10-08

Steps

Open the invoice
Open the approved invoice under Sales → Invoices. Its number is fixed and it has no Edit or Delete.
Create credit note
Choose Create credit note and give the reason for the credit note: pick one from the list, or Another reason and write it.
Choose what to credit
Each line starts at what is left to credit. Lower a quantity or set it to 0 to leave the line out; nothing can be credited twice.
Approve the note
The note opens as a draft: choose Approve. It takes the next credit note number and reduces what the invoice is owed.

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