SIR, WE HAVE FILLED GSTR-3B & GST-1 OF F.Y 2017-18. 
AFTERWARDS, WE FOUND SOME ERROR AND WE CHANGED GSTR-1, B TO C ACCORDINGLY FOR F.Y 2017-18 WHILE FILLING FOR F, Y 2018-19. 
AGAIN WE WANT TO MAKE SOME CHANGES IN GSTR-1 BUT IT IS NOT ALLOWING US TO DO SO. 
NOW, WHAT WE CAN DO, AS WE ARE ASSUMING THAT OUR 3B SALES WHICH WERE FILLED IS CORRECT AND WE HAVE TO FILE GSTR-1 ACCORDINGLY BUT WHAT WE HAVE ACTUALLY FILLED AND AMENDED IS FAR BELOW THAN 3B WHICH WE HAVE FILLED.
CAN WE AGAIN FILE GSTR-1 AND MAKE CHANGES IN THAT OR ELSE WE WILL RECTIFY THE SAME IN OUR ANNUAL RETURN 9?