It is possible to amend a GSTR 1 return if you incorrectly entered B2C supplies instead of B2B for the September quarter. You can correct this by showing the B2B supplies as usual and reducing the B2C entry by the corresponding B2B amount, including applicable taxes. This amendment can be made when filing your quarterly GSTR 1.
08 November 2022
Yes it can be done, you can show B2b supplies as usual since they were not shown earlier and amend the corresponding B2C by reducing the amount of B2C by the amount of B2b sales entered by you along with applicable tax and under corresponding tax rates.