Hi Suresh, here is a bad way to have what you want working, but it would be good to also raise a support ticket.
You can run an update statement on the MII NW table
UPDATE [XMII_JCOPROCRULES]
SET
[MSGNAME] = 'MSG_NAME/TEST'
WHERE [ID] = <Your Rule ID>
This will update the initially created rule and define the correct MSG Name.
Hope it helps,
Cheers, Arnaud