Query Studio Calculation does not work in the Calculated DataItem of the Package

[GGowtham]

In Query studio am not able to perform any calculations on the calculated data items from my Package.

When I select the data item and click the calculate button in the Query Studio am getting an message like

"One or more of the selected report items cannot be used in the Calculation"

1) In Query Studio no calculations can be performed on the calculated data items from the model ?

Note : My Calculated dataitem has a case condition and the properties for the calculated data item are
Usage : Fact
Regular Aggregate : Sum (or) Calcuated
Semi Aggregate : Unsupported ( No other options are enabled)