POT were applicable since july, now my case is, the services billed after july were considered for calculating ST payable. But when their payment were received in (say) for july bill payment recd in jan 2012. Now this receipt was again by mistake considered for ST payable in jan as it was considered for the services provided before july. Ultimately tax has now been paid twice for same service. Can anyone suggest any remedy in this situation? How the set off can be claimed for excess ST? N how to show it in ST return? Reply at earlist.