SQL Server Analysis Services Multidimensional Model - Merging Partitions with Slice

According to SQL Server Books Online: Partitions can be merged only if you meet all of the following criteria: http://technet.microsoft.com/en-us/library/ms175318.aspx.

• They are in the same cube.
• They have the same structure.
• They have the same storage modes.
• They contain identical aggregation designs.
• They share the same string store compatibility level (applies to partitioned distinct count measure groups only).