Missed sale invoice of earlier month.

gnv satish (46 Points)

26 August 2018  
We missed a sales invoice while filing Sep 17 GSTR-1.

What should be done now to get this transaction reflects in Buyer's GSTR-2 Sep 17 .

If we show this transaction now in our GSTR-1 of Aug 18 then this transaction reflects in buyer's GSTR-2 of Sep 17 or Aug 18 ?.