Calculated and restricted key figures!

Heyya everyone!

Can anyone explain me in simple way what excatly does this 2 restricted and calculated keyfig. means?I tried to create restricted key figure for eg: i created restricted key figure for open orders quantity for the year dec 1999 from sap demo infocube.then i dragged the cal month from the key figure and restricted it to dec 1999.and saved it and run.

But i didn't see any changes??i tried again changing it globally and dragged that restricted key fgure to the columns value saved and run.But it only showed the name of the restricted key figure i created..there was no results.

What excatly does this mean?

any fast help plzz.

Thanks in advance.

Shania.