we have availed a service from a client who got the gst registration on 28 Nov 2017.but he raised the invoice with the gst in the month of september.2017. we availed the input credit in the month of september 2017 how we can amend 3b
he has issued proper invoice after registration in the month of November 2017.whether i can issue a debit note in the month of september 2017 and ask him the credit note for the period.is it ok