[Issue Description] Previous versions of Analysis Services gave you the option of not including data members in parent-child dimensions. The DataMembers property of a dimension in previous versions of Analysis Services supported three options: None, Hidden, or Visible. The None option is not available in Microsoft SQL Server 2008 Analysis Services. Data members are always included in parent attributes. To hide the data members in parent-child dimensions, you can set the DataMembers property of a dimension to Hidden. The MembersWithData property for the parent attribute supports only two options: NonLeafDataHidden or NonLeafDataVisible. [Issue Type] 
Data members always exist in parent-child dimensions