Internal activities & service activity elements.

Hi,

I want to map a scenario using internal activities and service activity elements. I am facing a little issue as-

I have defined one internal activity under which i have defined 10 service activity elements with services data in them. I want to have plan cost data to flow from service activity element to the internal activity so that i can distribute it period wise. Currently this is not happening; i am unable to distribute data as the cost plan data is not coming on internal activity.

Any suggestions how i can achieve this.

Thanks,

Harsh.