Hi Vinay,
If you are missing both CEM Business Service/Business Transaction nodes (RTTM/btstats) & corresponding Agent Business Segment nodes that implies both types of CEM-Introscope integration are failing for the BT in question so it may be config related
However if other BTs & Business Segments are visible then it suggests the config is OK & it points more towards a monitoring problem for the specific missing BTs.
Have you checked the CEM UI to see if any defects are reported for the BTs under Incident Management?
A Support case may be more applicable for this scenario if you do not already have one.
Thanks,
Lynn