Assume that you have a cube that contains unary operators (~) on a regular dimension in Microsoft SQL Server 2012 Analysis Services (SSAS 2012). Additionally, a scope assignment is defined on the dimension members that have a unary operator (~). When you execute a Multidimensional Expressions (MDX) query to retrieve aggregated values on the cube, the result of the aggregated values is incorrect.
Install this Cumulative Update (CU) is not enough to have the correct result. Additionally, you have to change the value of CloneCoverItemForClosestWins to 1 in msmdsrv.ini. This parameter can have a performance impact.
The issue was first fixed in the following cumulative updates for SQL Server:
Cumulative Update 2 for SQL Server 2014 SP1
Cumulative Update 8 for SQL Server 2014
Cumulative Update 6 for SQL Server 2012 SP2
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.