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IBM Employees should enter Ideas at https://hybridcloudunit-internal.ideas.aha.io/
If a C level element exists in any hierarchy of a dimension it should not be possible to create a leaf member with the same name. If you can reproduce this in a current build of TM1 please open a support case with steps to reproduce. This would be a defect.
I'm not sure what you mean be the hierarchy being made to go away. It should not possible to delete the Leaves hierarchy without deleting the dimension that contains the Leaves hierarchy.