DesignStudio: failed to obtain SAP Assertion Ticket.....

Hi,

I've installed SAP BO BI 4.1 SP2 + DesignStudio AddOn. I configured STS and a OLAP Connection with SSO to the BW system. I also checked if the Security Token Service is selected in the APS service.

With WebI and Analysis OLAP I can use the connection a use Queries. But when I try to build a Design Studio app, when trying to insert a Data Source I recieve the Error "Failed to obtain the SAP Assertion Ticket...."

Any Ideas?

Best Regards,

Thilo