Good day, BigforkBookkeeping.
Let me show the steps to make sure that the credit memo won't apply to the incorrect invoice.
QuickBooks Desktop has a feature that allows a credit to automatically apply to an open invoice. We can turn it off so it'll remain on the account and use it anytime you want.
- Click Edit at the top menu and select Preferences.
- Select the Payments menu and go to the Company Preferences tab.
- Remove the checkmark in the Automatically apply payments box.
- Click OK.
Here are some of the articles you'll want to check:
Post again here if you need anything else. Stay safe!