Correction of invoice of F.Y-18-19 in gstr1

It's not possible....You can not do amendments now

Not possible..

you can ammend it in sep-19 return...

It's not possible now
but if you have by any chance left any Gstr1 to fill in that particular year then its possible

It's possible to amend an invoice relating to fy2018-18, as per govt notification the amendment can happen before filing of September return of the following year or before filing of the Annual Return of return.

as the annual return filing date for FY 2018-20 is extended upto 31st October 2020, you can make ammendments to invoices of 18-19 before filing of annual returns.

@ Mr.Mohd Ajaz Uddin

It's filing GST Return for September of next Financial year
OR
Date of filing the Annual Returns relevant for that Financial year

"[WHICHEVER IS EARLIER]"

So, earlier in both is September, 2019 return which is already passed.