Formulae activation in VOFM

HI Experts,

I have added 2 formulae in VOFM=> formulas=>Condition value for conditional sub totals.

I Have activated them in VOFM(Check box).

Still these formulae are not getting triggered. Is there any thing more that i need to do for activating the same?

I did execute the program "RV80HGEN" also.

***Help ful suggestions will be rewarded.

Thanks,

Mohammed.