When a checker rejects a particular record, then the maker can either "Edit" or "Discard" the record by going in the "Approval" tab. If the maker edits the record, then it will go to the checker for approval. If the maker discards the records, then ...
The bank admin has the rights to reset the checker/ maker ids. NPCI can reset the Admin ids only. Please ask checker to connect with Bank admin for the needful.