Local Calculations 
Use
You can recalculate single values and results of a report based on certain criteria. For example, you can create ranked lists or you can calculate the total of a Top 10 product list locally.
Integration
You can execute the
local calculations function from the Query Designer in structural components
in the 
Properties of the
Selection/Formula, from the BEx Analyzer in the Properties of the Key
Figure dialog, or from the Context Menu of
Web Applications.
Features
Local calculations include only those numbers in the calculation that appear in the current view of the report. In this way, you override the standard OLAP processor calculations.
Note that these local calculations only change the display of the values. With subsequent calculations, such as formulas, the system does not use the values changed for the display, but rather the original values specified by the OLAP processor.
For more information, see sections: