BSP Exception: Access to URL /irj/servlet/prt/portal/prtroot/com.sap.ip.bi.web.portal.integration.launcher;jsessionid= not allowed

Dear all,

I've created out BI system in our new Portal installation and tested the connection. Everything works fine. I added the certificate of the portal to STRUSTSSO2 in BI ABAP and assigned SAP_ALL and SAP_NEW to my Account.in BI. If I open the iView from the portal I get a BSP Exception with the message:

The used connection by the iView is to the ABAP-Stack of the BI-system not to the JAVA-Stack. Is that correct?

BSP Exception: Der Zugriff auf die URL /irj/servlet/prt/portal/prtroot/com.sap.ip.bi.web.portal.integration.launcher;jsessionid=IDBYatWIpt_pX4uc52ChoZqMWkm1RAFW2qsA_SAP ist untersagt.

What can be the problem/reason?

Thanks!