Dear SD-Team and community,
I’m not sure if this is intended behaviour and if so, how to work around it.
I’m importing/providing a .3dm with “SD Import Geometry”. I want to attach transformations to some of the geometry inside. So I use “Attach Transformations” to achieve this and it works as intended.
Unfortunately every time I change the transformations, the “Attach Transformations” is throwing an error saying: “Solution Exception: Ein Element mit dem gleichen Schlüssel wurde bereits hinzugefügt.”.
After a recompute everything is displayed correctly again.
Actually I found a workaround: When I do a “Mesh join” operation before inputing the transformations it works always and without a recompute. I guess this clears all attributes and that’s why it works? Bit of a pity though… all those nice attributes from the .3dm gone… 
Any other way?
Thanks in advance,
David