Thank you Didier, this is good to know, but my problem is different.
I made deformable cable strap model so we can reuse it in different positions. It is model with routing/space reservation that is used to customize shape of strap in different positions and for different amount of cables strapped together. You place strap, go to deform component, edit routing spline by moving and/or add/remove points and you get different shapes of strap.
One of problems is that when placed in assembly it come with active deformation,
instead without any deformation.
And I can't figure out why is this happening.
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Enjoy your work and have fun!