Calculated Key Figures in IP FOX

Hi,

I would like to modify the calculated key figures using custom Formula planning fuction (FOX). Can some one let me know how to change these calculated key figures from BEx.

I have found a thread discussing the same topic.

Business Planning

So do we have to definitely create a key figure in real time cube to be able to change the values in BEx calculated key figure.

this is only for simulation purpose based on some key figure values and not for storing values in the cube.

Regards

Bhav