I have a parent-child hierarchy based on departments and sub-departments in a Department dimension.

There is a separate field that is a flag I want to slice this data on in my cube. How do I configure the dimension so that field is visible?

I have it set up as a regular attribute, with AttributeHierarchyVisible true, but when I view the dimension in the cube browser, it's nowhere to be found.

I tried creating a user-defined hierarchy from the flag to my departments, and it still does not appear. If I click "Show all attributes" it will appear under the description of the member, but it is unavailable for filtering. 

Can anyone explain why this is happening and how I can correclty reference the flag for filtering?