if you add in 2018 how will the 2017 annual return will tally....example for this case...for 2017 total return ...Total Gstr 1 is 150 total Gstr 3b (sales) value 120 since he missed 30 in his Gstr 3b of 2017 but he add this amount in 2018 ...or how we should file Annual return for 2017