thank Mathias and Christian...
i already saw the videos but it didn't contain anything about browser based app like BSP or Fiori...
got the point that on the netweaver system SNC should be enabled and for every user setting needs to be maintained.
I earlier worked on Duet , in that we can maintain mapping of sharepoint user and sap user in a table VUSREXTID , where its possible to map multiple sharepoint user to single sap user.
I suppose x.509 certificate is used by duet and no setting is required on SNC tab for user.
is this kind of setup possible with fiori ? i am using transactional apps.
Regards
Yashpal