POC is not aggregated from Activities to WBS

Hi All,

I am doing progress analysis based on quantity proportional method.

If i plan and post SKF on WBS , and run CNE1 , i can see the POC aggregated to higher level WBS.

But i am not able to do the same if i use activities, POC is not aggregating from activities to higher level WBS.

Can anyone tell me the possible reason for system behavior.

Regard

RAJIV