
We raised an invoice to the customer and then re-issued for a lesser amount (original invoice reversed / voided); customer has paid the original invoice leaving an overpayment on the account.
How do we apply this overpayment in GP therefore leaving a debit on the account which will be netted off when they shortpay the next invoice.
When the customer makes an over payment, there really is nothing that you need to do. Once you record the PAYMENT, the customer record will show the CREDIT and when you raise the next invoice and they shortpay, you will have the outstanding CREDIT to apply to the new invoice, along with the short pay, and all will be good.
Hope this helps. If you have other questions, please post and the community is bound to have a word or two to share on how to solve.