Hi,
When configuring a cost control workspace you can either choose a "Statistical dimension hierarchy" or a "Cost element dimension hierarchy", not both at the same time:

As the Microsoft documentation says:
A Cost control workspace configuration record can report either non-monetary or monetary values, but not in the same layout. Select a value in the Cost element dimension hierarchy field to report monetary values. Select a value in the Statistical dimension hierarchy field to report non-monetary values. The dimension hierarchy record that you select determines the structure of the reporting and aggregation levels.
I cannot think of a real life example of when the statistical dimension would be used, any ideas?