Auto Dimension in assembly (another try)

i am trying to get some dimensions into an assembly…

but i just can’t figure it out…

At the moment i am using the surface, more ideale would be the perimeter curve… because a surface could be in an angle and in plan you want the perimeter lines… but for now i would settle for the surface…

i filtered the directions and the surfaces, but it won’t place my dimensions… Does anyone see why…

Dimension.assembly_2.dyn (171.6 KB)