Mr. Sanjita Deb., Don't worry your supplier also enter the HSN code his GSTR 1. The suppliers GSTR 1 converted GSTR 2 to you. So., Why you feel..... Relax and go to improve your GSTR 1 as no mistakes... GOOD LUCK........
At the time you use HSN... At registration time which HSN you enter then use the. It's not matched your goods then you can add the HSN in GST portal after Amendment section open....
CAclubindia
