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MDDataProviderBW.GetHierarchies 
Functions
The
GetHierarchies method for Business object MDDataProviderBW returns a list of hierarchies for a DIMENSION (BW InfoObject with type characteristic) of a CUBE (BEx Query).All active external hierarchies are returned as a simple (trivial-) hierarchy relating to the master data table for the characteristic.

You can find additional information from
Notes
This method is instance-independent.
Parameters

You can find additional information about the importance of individual parameters under
Parameters.