Hi Ramesh,
It seems you are using the NWBC, right?
You can check then the following:
1791968 Inbox: Status message contains technical info of
1703117 - Error message displaying technical details
The action is maintained at table IBO_C_WF_TTAC:
SAPSRM_IBO_INBOX TS79007914 OLDWFL.APPROVE
SAPSRM_IBO_INBOX TS79007914 OLDWFL.REJECT
Thanks,
Melina