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This sounds like a defect or we are missing more specific details about the problem. Using a current version of TM1 Server (PA 2.0.9.11) we tested creating a new dimension with a few leaf members. We then created an alternate hierarchy in the dimension with a leaf member that is not in the same named hierarchy. We then tested added some leaf members to the alternate hierarchy that have the same name as the members in the same named hierarchy. This was not able to reproduce an error message.
If this was a very basic defect it seems to have been resolved.