Pre-filtered hierarchy as query filter

Hi,

I built an universe on an OLAP cube. The dimension dimDepartments contains the attribute DepartmentID and the parent-child-hierarchy DepartmentHierarchy. The dimension dimUsers contains the attributes UserID and UserName. The DepartmentID and UserID is connected through the bridge table bridgeDepartmentUser.

dimDepartments               dimUsers               bridgeDepartmentUser

     DepartmentID                    UserID                  DepartmentID

     DepartmentHierarchy        UserName            UserID

I'm using the DepartmentHierarchy as a query filter and it works fine.

But now, the DepartmentHierarchy should be pre-filtered by UserName, so it shows only the querying users departments and not the whole DepartmentHierarchy.

How can this be achieved?

Thanks,

Nic

Tools: Information Design Tool 4.1,  Web Intelligence Desktop 4.1, SQL Server 2008R2