From the Banking menu, select Transaction history. The Transaction history page appears.
In the Account field, select the bank account into which the customer payment was made, or select All bank accounts.
In the list, find the customer payment that you want to delete, and click the link in the Reference Number column for that payment. The View payment screen appears, showing the invoices to which the payment was applied. If you’re having trouble finding the payment, it might be helpful to adjust the date range shown in the From and To fields, or to click on the Received column heading to show the transactions in order of amount spent.
Click Yes to the confirmation message.
If the deleted payment was matched or allocated from a bank feed, you'll need to match or allocate the payment again.