How to use MSAS security in Analysis Studio

[dimi]

Hello,
Cognos tells me it is possible to use the same security in Analysis Studio like in MSAS. For example: i have several roles in a MSAS cube, where serval dimensions are restricted for some roles. So if a sales rep navigates through the cube he can see only his customers...
Cognos tells me this also possible in analysis Studio, if i only set the same external namespace in the datasource connection like in MSAS (ic Active Directory).
If i try to do this, this does notÃ,  work -> error: logon failed ...
Does anyone have experience with this?