Is there any arrangement through which I can issue CN to my Client, and reverse the GST credit given to him by Sales. The Sale was incurred in 2018-19, and since then he has not paid any amount against that invoice. We have blacklisted that Client and no future business will be done with him. But is there any arrangement to issue CN for Sales on 18-19 in 20-21. The value of invoice is 10,00,000 + GST.