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Configuring User Management 
You need to make several settings in user management of the portal to enable single sign-on between SAP BW 3.5 and SAP EP 6.0.
The SAP
reference system is required for communication from the BEx tools in the
portal. Maintenance of a SAP reference system is only necessary when the
technical user names in SAP BW and SAP EP are different and user assignment is
necessary. You can makes sure that the user names are identical using the
central user management. For more information on the SAP EP side of this, see
User
Management Engine
and
UME Data Sources.
On the SAP BW side, you can find more information about centralized user
management at
Directory Services
(BC-SEC-DIR).
For more
information, see
Security.
1. Log on to the portal.
2. Start the iView System Administration ® System Configuration ® Configuration for User Management.
3. Choose the Security Settings tab page.
4. Under SAP reference system, enter the standard system alias of the BW system (see Creating a BW System in the Portal).
5. Save your entries.

Only one system can be specified as the SAP reference system. The SAP reference system does not have to be the BW system. However, if it is not the BW system, the technical user name of the BW system has to be identical with the technical user name of the SAP reference system.
If you want to connect multiple portals with the same system ID to a BW system, you have to maintain the login.ticket_client parameter:
...
1. Log on to the portal.
2. Start the iView System Administration ® System Configuration ® Configuration for User Management.
3. Select the Direct Editing tab page.
4. Insert the following line: login.ticket_client=<CLIENT>
5. Save your entries.

You can select any value between 000 and 999 as the <CLIENT>. The client is necessary if several portals with identical portal SIDs are connected. The client has to be entered when you import the portal certificate into the BW system on future occasions.

After making changes to user management in SAP EP, you have to restart the J2EE Engine with SAP EP.
