If value of service provided to a SEZ (GST :Nil) is not included in GSTR 3B of that month but while filing GSTR 1 it has been taken into account then what will be the consequence?
No consequence... Be sure correct GSTR1 has been filed... Gstr3b is just a provisional return for the payment of tax.... On the basis of GSTR1 filed ur gstr3 will prepare