HI Kalyani
Please see if these are new users OR old users where you are trying to update the data for the users ?
There are a lot of things which may influence integration between HR system and SRM system. You have to make sure that all organizational units are transported with the addresses (Country, City and Postal Code); also check in customizing Country regions, they have to be one and the same in HR and in SRM;also check employee data infotype 0105 (any erros in the definition of the address and email address) and if user IDS are created in SRM, they should also have user master record created in HR system.
Check the errors as below :
1. You might be able to see error like this in WE02 or BD87 in the IDOcs which failed to get posted ..
We02
51 Application document not posted HR: ALE inbound processing for HR mas
2. Try to run the BBP_BP_OM_INTEGRATE for that org unit and check if the BP number gets generated
3. HRALXSYNC for the user and it will tell you integration details
4. Check in SLG1 as well for the reported errors
Regards
Vinita