An Invoice may be canceled by clicking on 'F5: Others' -> 'Cancel' as
shown below:
If an invoice is canceled then it shall not appear in Party's account. The
amount is shown in strikthrough format like 2000.00in previous bills
information window.The canceled bill can be un-canceled by clicking 'F5:
Others' -> 'Un-Cancel'. The 'Un-Cancel' option appears only when you
have selected a canceled bill.