Defective VAT Return

Viral Chheda (12 Points)

18 May 2017  
During the year we came to know that Return filled by us during FY 2012-2013 was defective. In "Annexure J1 of Sale" Purchase detail was filled and In "Annexure J2 of Purchase" whole Sales detail was filled. Now we want to rectify our Return.
In view of the above situation, Kindly suggest us what can be done by us to solve the above mistake.