I think i am getting closer.
Shanker comment helped me; FM was returning empty.
check in ECC side, run the FM HRWPC_RFC_OADP_GET_NAVOBJECTS
Pass the values as below
OBJSEL MSS_BIZ_NOD
BEGDA <todays date>
ENDDA <todays date>
USER <user ID>
Under ODP Selection rule 'MSS_BIZ_RULE2' i added Position. Now i can see all the entries with less details.
Any suggestion.
Thank you all for helping with this.