Hi Maheshwaran,
If you are using a master data Idoc throw ALE you can debug the correspondign IDOC_OUTPUT* FM to check if the is not retreived from database or mapped in the Idoc. You can force this using a user-exit for corresponding segment.
If you are using a transactional Idoc throw EDI you can do the same but debugging the correspondign RNASTED application rutine.
Reward points if useful.
Roger
