Hi Subhrajit,
mirror deals functionality is available for the following financial instruments: fixed-term deposit, deposit at notice, cash flow transaction, interest rate instrument, foreign exchange, and foreign exchange swap -> see a Section 'Features' @ Mirror Transactions - Product Types in the Transaction Manager - SAP Library, so I'm afraid 62B is simply is not within the scope of Mirroring functionality.
hope this will help you.
Kind regards,
Renatas