Ans: Partial cancellation of an e-invoice is not possible. E-invoices must be fully or wholly cancelled if they must be cancelled. The IRN must be notified within 24 hours of the cancellation when this occurs. After that period, you cannot cancel an e-invoice using the IRN. If you want to cancel, you must manually do it through the GST portal. Before filing the returns, this must be done. Invoice numbers cannot be reused when you cancel, and a new one must be generated; otherwise, the IRP will reject it.