CA
410 Points
Joined June 2017
Dear Asif,
1st thing, Dec'17 GSTR-1 will not accept the same invoice details as provided in Sep'17 return. Because, repetition of the invoice number will not be allowed by the system.Kindly cross check.
Further, if the wrong data is filled and submitted, you have to file the return as you don't have any reset option for GSTR-1.
All the errors should be rectified in the GSTR-1 to be filed for Jan'18.