If you need to bring a credit note back outstanding, you can delete the refund that you've matched to it. You can then use the credit note to pay another invoice.
Cause
Resolution
Delete the refund
Go to Banking, then open the relevant bank account.
Locate the refund in the Activity tab.
TIP:
Use the From and To boxes to adjust the date range. Select More and under Type choose the relevant transaction type.
Select the checkbox next to the transaction you want to delete, then select the Delete icon.
Select Yes to confirm the deletion.
Now you've delete the refund. You can match the credit note to the correct invoice.