Amendment of amended invoice in Gstr1

Agree to Pankaj comment. Elaborating the same here

As you have already amended the invoice, it will allow to do any further amendments.

Possible solution approach

As you have already issued Invoice to wrong Party, raise Credit note for full amount. so that it will be zero.

Raise a new invoice to the actual party of either backdated or current period, so that Buyer can take ITC.

Request experts comment 

We made one Freight invoice no.227 on 14.09.19 Rs.231520/= . While filing GSTR1 For the Month of Sept'2019 Rs.132820/-.

Can we amend the same invoice in the month of Nov'2019 B2B.