I can see that you've asked this question on a different thread. Let me help you out.
There are only two statuses for a credit memo, Unapplied and Closed. It shows as Unapplied when it's not applied to an invoice. When applied, the status will change to Closed.
The steps below will change the status of a credit memo from Unapplied to Closed:
Open the invoice and click Receive payment.
In the Outstanding Transactions section, select the open invoice you want to apply the credit memo to.
In the Credits section, select the credit memo you want to apply.
Click Save and close.
I can also see that my colleagues have shared good references for credit memos. You can check them out.
I'm just a comment away if you need more help. Take care and have a good one!
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