Physics Body Components within a hierarchy behave weird

Ok, I am loading an object from a Reality Composer Pro scene that has two entities inside its hierarchy that both have a Physics Body and a Collision component like this

Root

  • Outer Box Mesh
    • Hinge + physics(static/kinematic) + collision
      • Door. + physics(dynamic) + collision

I tried to keep the physics/collision components only to the hinge and the door while I move the root or the outer box via code around. The behaviour I see is that it either

  • moves the hinge and the door around relative to the top level (despite me checking the movement locking) OR

  • starts rotating! the root or outer box even though I only set its position.

What is the correct setup in this case? What I want is that I can move the whole object around and settle it somewhere and still have the door pinned at a fixed relative position and have one degree freedom on the hinge axis.

I know how to do it in code but I really want to use the build in Reality Composer Pro settings/components. I am using the latest beta 4.

Physics Body Components within a hierarchy behave weird
 
 
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