Hi Daniela,
This issue seems to be more specific to Web/Application server rather Semantic Layer.
To be honest, I have always used seperate QAAWS queries or Web Service rather using a Group as there is no direct option.
In order to use QAAWS queries and LiveOffice, dswsbobje webapplication is used by BusinessObjects.
You might dig into its deployment and check which config files need to be customized.
Below link can also help in some way i suppose:
http://<servername:portnumber>/dswsbobje/services/Session
Would suggest you to post on different forum.
Regards,
Yuvraj