Hi Marie,

The invoice cannot be reversed although a credit memo can be entered and a replacement invoice created. The payment applications will need to be cleared through the apply payments and memos option in AP or on AR, the reverse applications function. Then these payments will be available to apply to the replacement invoice. You should be able to select which application (invoice) to remove for the given payment, leaving the application intact for the other invoices paid by the check.

For AP, there is a KB solution ID: 222924450019821, entitled "How to reverse an Accounts Payable check" You may have to enter a replacement payment to apply to the new and existing invoices once this is done. AR is easier because there is not a physical/manual check relationship.

If you are still unsure of the process, you can either test this on a test company or create a ticket with support for further assistance.