How to reverse by mistakenly accounted credit note

Just amend the credit note in your next GSTR-1 by selecting point 9C in GSTR-1. Put the values as 0 or 1.

Dear shivam sir,

If i amend my credit note then how my 3B will be tallied & also how to adjust it to my book of accounts?

You will adjust the credit note in your next GSTR-3B also if the credit note was considered in earlier GSTR-3B.

In your books of accounts you will just pass a reversal entry for reversing the credit note.

Make a reconciliation statement for future GST Audit purpose. This will help a lot.

Dear Shivam sir,

Suppose if i upload as a debit note in GSTR-1 it will not reversed?