GST Sales accounting entry

sir, I wrongly entered debtor one local sales instead of IGST sales in Nov 18 and filed GSTR 3b on same month.Since I want to reverse it and to be shown as correct sales.Kindly tell me a Entry to be reverse it and put it on IGST sales nw. 1.what is the reverse entry and when to show it? ,Nov18 or march 19 2 what is the correct entry to be show in tally or whether put on omission on March 19 year end closing.