How do I correct an invoice error in QuickBooks?
Invoice item changed errors
1. Go to the Customers menu at the top. Then, Customer Center.
2. Find the customer's name.
3. Double click the Invoice to expand/open the page.
4. You'll see that the amount shows 0. Then, enter the amount paid.
5. Hit Save and Close. ...
6. Make sure to checkmark the available credit.
7. Click the Done button.