Activity Types Plan data regarding to WBS Elemt

Hi Experts!

I would like to get the plan data for Activity Types regarding to WBS Elements! (not regarding to Cost Centers)

Is there any pre-defined data source for this?

Or if it's not, anybody tried to make a generic datasource for this (which table contains this information in the R/3 system)?

The transaction in R/3 system with which you can add these plan datas for Activity Types regarding to projects is: CJR2

(My problem is that this plan data of activity types seems like to be attached to cost centers and not wbs elements, while with the CJR2 transaction you can define a WBS element for a plan data of an activity type, so there must be some connection with project elements and activity type plan datas)

Thx in advance for your help,

Corran