B2c Amended to B2B

MIDHUN E (ACCOUNTANT) (53 Points)

14 February 2020  
one of our known person who Filed return on 2018 - 2019 on regular and 2019 -2020 Composition scheme opted .

In 2018 -2019 I want a invoice amendment to b2b , how can I rectify the mistake in gstr1 .