Ranj,
If your scenario is Sync then make sure you have enabled Sync logging in SXMB_ADM (if your PI System is dual Stack). Make Sure RFC destination is Working Properly and there are no Error Entry in Transaction SM 58.
If can also put RFC Adapter in Debug mode for while to check the flow. Check Message Monitor in RWB. Check your communication channel in RWB if it is in Error.
Thanks,
Sunil