Cda for mvat

Hi Members I have recd the CDA notice from MVAT for F.Y. 12-13 in which liability arise under CST which has been shown as payable in our Vat Audit Reposrt by our auditors. I wnat to know that the amount should pay with Interest or only liability raised. and how to file the report. Should i have to revise the return for the period by paying the liability raised amount.

please please reply  urgent.

Regards

Ankush