This question doesn't seem to be a question about the OLAP PivotTable Extensions but just general MDX. The following would be better places to ask this:
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/home?forum=sqlanalysisservices
http://stackoverflow.com/unanswered/tagged/ssas
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/home?forum=sqlanalysisservices
http://stackoverflow.com/unanswered/tagged/ssas
