credit note by seller

Shivish Verma (C A) (376 Points)

03 May 2019  
Sir

my client has sold goods on 31 March 2019 . but the buyer has not accepted the same due to some issue. But seller came to know about this after 10 days. Till then seller has filed gsr 1 by considering that invoice.
Now, he wants to reverse that invoice in gstr 1 of subsequent month.

Can he make credit note on his own and reverse sale. Because the customer will not issue debit note as he never accepted the goods.

What are the options the seller have to reverse the supply in gstr 1

pls help friends