Immovable constraint for edge/faces

Hi,

I dont find use of immovable against fixed constraint. Indeed, theway immovable works is same as fixed constraint in cosmos foredge/faces.

Proof:
Immovable means, del x =del y = del z =0. And there can berotation. When i say permit "rotation" but not "movement" (for anon-point object), i need to define a axis of rotation, whichCosmos never ask me when i apply immovable constraint to a edge orface.

Result: The result behaviour is same on a given edge/face for bothimmovable/fixed.

Question: Does that mean immovable constraint is for point objectonly.

ThanksSolidworksSimulation