Hi Subhash,
To be able to execute the initial load for Customizing tables from ERP to CRM/SRM, the user that is entered in SM59 for the RFC connection to ERP requires authorization one of the authorization object SCRMMW.
Relevant NOTES
1511198 - Cannot execute Report SMOF_FILL_CRMATAB
1501685 - Table CRMATAB is empty
1502607 - Potential disclosure of persisted data
1498111 - No authorization for data selection in initial load
1499392 - Berechtigungsobjekt für CRM Middleware
You'll find all the information you need in these notes. And the missing reports like SMOF_FILL_CRMATAB and a host of other funcitons modules required will be present in the aforementioned notes.