Note: To change anything besides the invoice amount and/or invoice distribution, simply open the invoice record and make any necessary changes. Be sure to save and close the invoice once the changes have been made. To make changes to the GL distribution of the invoice, follow steps 1-5 below. If you need to delete the invoice, follow steps 1 and 2, and then open the invoice and click File>Delete. 
1. Void the payment (BB59007)
2. If you would like to reuse the payment number, you will need to Purge the payment after voiding it (BB53728)
3. Go to Records> Invoices, and open the invoice record
4. Make any necessary changes
5. Save and close the invoice record