BILL DTD. JULY 17 SHOWN IN GSTR3B SEZ SALES WITH PAYMENT OF GST SHOWN IN OUTWARD SUPPLY AND WRONGLY NOT SHOWN IN ZERO RATED SUPPLY. IN GSTR-1 SEZ SUPPLY SHOWN IN B-B SECTION UNDER OPTION OF SEZ SUPPLY WITH PAYMENT. NOW I AM APPLYING FOR REFUND OF IGST AGAINST SEZ SUPPLY WHERE THE SYSTEM SHOWS ERROR THAT `NOT SHOWN IN ZERO RATED SUPPLY IN GSTR-3B. I HAVE ALREADY FILED GSTR-3B OF SEPT 2018 SO CAN I SHOW IT IN THE MONTH OF OCT-2018 GSTR 3B UNDER ZERO RATED SUPPLY BY REDUCING OUTWARD SUPPLY.