Wrong payment

Rohit (Student and Learner) (38 Points)

15 July 2019  

If I have paid IGST by mistake in return GSTR 3B instead of CGST and SGST. How will I ratify it in annual return? Do I need to make payment or it will be adjusted ? At that time, when I realised the mistake , I have  not claim  any refund on it instead I had adjusted it against return 3B of later periods.