If the credit note is still a draft, you can edit it or delete it using the Delete button at the bottom of the page. If you already finalised the credit note, you must first cancel the incorrect credit note entirely and then create another credit note.

1. If payments are still missing, add a payment to the incorrect credit note even though you will not refund the money yet.
2. Create a new credit note for the incorrect credit note and select a Fully credit the invoice. Select all available payments to refund and select Continue. This credit note will have a positive total since you are cancelling the first credit note.
3. Create another new credit note on the previous credit note and select Credit some invoice items. This time, add the correct amounts or percentages.

Note that the process may be more complicated if payment integrations have been used.

For full refunds, see I created a credit note but used the wrong date.

See Also

Credit and Refund a Finalised and Paid Invoice in Full

Credit a Finalised Invoice That Has Not Been Paid

Credit and Refund an Item or a Part of an Item