Calculated Key Figure

Hi Expert,

I have 2 global RKF (RKF1 & RKF2) in infoprovider and 1 global calculated KF(CKF1). My formula is CKF1 = RKF1*RKF2. When I used the keyfigure CKF1 in the query it seems that it also perform the calculation in hierarchy nodes which should not. I tried to set the setting in calculating before aggregation but it is not possible. I also read about exceptional aggregation but I could not find it in the setting of my CKF.

Can anyone help me on this issue. I'm currently using BW3.5* version.

Thank you for your helps in advance.