CA
410 Points
Joined June 2017
You can amend the details.
If it is B2C, refer table no. 10 of GSTR-1, In the drop down, select the month for which the amount was incorrect and provide the correct amount i.e. taxable value.
If it is B2B, Refer to Table 9A of GSTR-1, you have to provide the original invoice number and fill the correct details.