[Issue Type] Autoexist can produce different query results when multiple hierarchies are migrated into the same dimension [Issue Description] 
When multiple hierarchies or virtual dimensions are migrated into the same Microsoft SQL Server 2008 Analysis Services dimension, querying the migrated hierarchies contained in the dimension may produce different results than querying the same hierarchies when they were in SQL Server 2000 Analysis Services, because autoexist functionality automatically removes tuples that do not exist in the dimension from any cross-join of sets containing members from the migrated hierarchies. To resolve this issue, you should review calculations that involve multiple hierarchies in the same dimension.