Hi Sridhar,
We need to follow below steps while changing Vendor Recon Account:
1. Maintain the new Recon account and adjustment account in t-code OBBW
2. Change the Recon account in all the affected vendor master records from old recon account to new one
3. Now execute the transaction F101. The items from the old recon account will be assigned to the new recon account and this will be achieved by making use of the adjustment account as below.