Cannot find Ax queries into visual studio to create reporting services reports


I’ve 2 servers: one for AOS, an other for DB and both on win2008 SP1.

I’d like to create reporting services reports with visual studio. So first, I create a new query on AX 2009, then open visual studio, new project … and on clic on VS query browser button: error: " Session log on for Microsoft Dynamics failed. "

I’ve created a business connector user wich is “execution account” in “reporting services configuration manager”. This user is also setup as “Proxy Business Connector” in AX.

The very strange thing is that I can launch reports with (*) from AX…

Any idea why visual studio isn’t able to find AX queries? is it because of business connecor, architecture, other ?

Thanks very very much !