Unapply Customer Payment on a Closed Period

To accomplish this, a user needs to:

1. Log in as an Administrator
2. Go to Setup > Accounting > Manage Accounting Periods.
3. Click on the Period where the Payment record lies.
4. On the Edit Base Period page, check the Allow Non-G/L Changes box > click Save.
5. Open the Payment record > click Edit.
6. On the Apply tab > Invoices subtab, uncheck the box representing the incorrect Invoice > click Save.

Make sure of the following:

7. Navigate back to Setup > Accounting > Manage Accounting Periods.
8. Click on the Period where the Payment record lies.
9. On the Edit Base Period page, uncheck the Allow Non-G/L Changes box > click Save.