Hi Ravi,
The users which are there in CA PPM gets synced to Jaspersoft user but those users cannot be used to login to Jaspersoft studio. If you want to login to the Studio, you need to do the below
1. Login to CA PPM
2. Navigate to Advance Reporting
3. Under Advance Reporting go to Manager Users
4. Create a user and add ROLE_ADMINISTRATOR
Now use the same user to login to Jaspersoft Studio.
Hope this helps
Regards
Suman Pramanik