How to check Ancestor/Parent of shared member in MDX

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Hi gurus,

In the ASO cube, I have the main hierarchy and alternate hierarchy like below.

Main hierarchy:

North America

        Ent 1

        Ent 2

       ..............

Alternate hierarchy:

North America Reporting

      Ent 1(shared)

      ...................

 

I have a request in a member formula with MDX to check if the current entity is Ancestor/Parent of a specific entity(e.g. Ent 1) then do some calc. Using IsAncestor() or Is(xxxxxx.Parent , xxxxx) it only work for North America, but not working for North America Reporting.

Is there any way to get around this?

Thanks!