SAP NW CE 7.1: Sign-on to R/3 backend with Portal User

Hello,
I have create a an Application Service. There I have imported some RFC and created some operations to read data from the R/3 backend and write in R/3 backend.
I have created an other Development Component. It's a EJB Module. With EJB invocation I get access to the Application Service.
The next step is to use the EJBs with Web Dynpro with the an EJB Model Import.
Now my questions:
How can I realize that this user who sign on in portal and excute the Web Dynpro Application also sign on at R/3 backend. In NWA at Destinations I changed the Logon Data--Authentication from Technical User to Current User (Logon Ticket).
Now I get the following exception:
java.lang.IllegalStateException: No SAP logon ticket found for destination TDE.
I execute the methods of the EJB in a test-class via JDNI-lookup.
How can I create a logon ticket for my destination?
Do I have "only" to follow the instructions here for http://help.sap.com/saphelp_nwce10/helpdata/en/4d/dd9b9ce80311d5995500508b6b8b11/frameset.htm for Scenario 1?
How can I deliver CAF the userid and password?
I implemented a test-class where I use the EJB of the EJB Module. How can I give CAF the userid and password of an PortalUser?
Redards,
Armin

Hi Armin,
Unfortunately, I cannot answer your question about logon tickets. But regarding user propagation to the CAF Application Service:
When you access the Portal / WD app, you authenticate with some user. The latter is automatically propagated to the EJB in the EJB module and then to the EJB implementing the CAF service. So, you don't need to do anything explicitly.
HTH!
-- Vladimir

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