Mark as correct for the benifit of other users.
please see this site and check Oracle Tech note to fix your issue : http://joeferna.blogspot.ch/2012/10/master-notes-for-obiee-integration-with.html
Hope it helps,
You should be first looking into the Security Guide - [http://download.oracle.com/docs/cd/E14571_01/bi.1111/e16364/ebs_actions.htm#CJAFDEIB]
NOTE "555254.1" Enabling Action Links in Oracle Business Intelligecne Applications for Oracle E-Business Suite"
NOTE:755768.1 - OBIEE integrated with ebs: Directly logon to OBIEE without going via EBS route
To troubleshoot login issues : Integrating OBIEE with E-Business Suite gives message "You are not currently logged in to the Oracle BI Server" [ID 749190.1]
Most likely if you check your nqserver log file, if you see the NQ_SESSION.ICX_SESSION_COOKIE has no value definition then you need to modify the connect script in your InitBlock connection pools.
Let me know if you have any questions.Hope this helps. Pls mark if it does.
do you have access to ":755768.1 - OBIEE integrated with ebs: Directly logon to OBIEE without going via EBS route"
i can't find it on metalink or anywhere else ,can you help ?
if not,do you know where can i find the steps to make OBIEE use the credentials of EBS users?