If you've filed a sales invoice in your GSTR1 return and later need to cancel it, you have two primary options. You can either amend the original invoice by setting all its values to zero, or you can issue a credit note to the purchasing party in the current month.
30 March 2022
Dear fellow professionals, i have a query regarding a sales invoice of october. I had taken this in my gstr1 oct return. After which this invoice was cancelled. should i amend this invoice or issue credit note to the purchasing party this month?