Cost aggregation from Activities to WBS

Hi Gurus,

Whenever I add activities for internal/external/cost to a network on a WBS, I can see the plan cost show up under the network, but it does not aggregate to the WBS element level. I would love to enable this feature, as users no longer want to manually cost a certain type of project.

I believe it's a customizing setting under Project Systems -> Costs -> Planned costs -> ???

I am not using easy-cost planning. I manually add a network+activity to my WBS in CJ20N, and then assign either material or labour (or cost) to the activity.

Any help is appreciated.