Financial transactions credit note

A user is facing an issue where they cannot add a credit note to their GSTR1 return because the original invoice number is not found. This is because the credit note was issued by the user in response to a supplier's debit note for delayed payment, rather than the user issuing the original invoice. The debit note has already been adjusted in GSTR3B. The discussion clarifies that as a recipient, the user should not have issued a credit note; instead, they should have claimed the ITC from the supplier's debit note. The correct procedure involves reversing ITC if inward supplies aren't reported in GSTR1, and reporting such transactions in GSTR3B.