Credit memo to cancel an invoice

Hi @Martine13 

Normally, when a credit memo isn't linked yet to an invoice, the status will show as Unapplied.

To apply a credit memo to the open invoices, follow the steps below:

1. Click Sales from the left pane.
2. Select Customers and click the customer’s name.
3. Locate the invoice you want to apply the credit to and click Receive Payment.
4. Enter the necessary information on the Receive Payment window.
5. In the Outstanding Transactions section, make sure that the correct invoice is selected.
6. Click Save and close.

Also, you can turn on the credit memo auto-apply feature. This feature will automatically apply credit memos to customers' balances or open invoices. 

Here's how:

1. Go to the Gear icon.
2. Click Account and Settings then tap the Advanced tab.
3. Select Edit ✎ in the Automation section.
4. Click Automatically apply credits.
5. Hit Save, then Done.

Please reach out back if this does not resolve your issue.

Noelia