Dear all,
just wanted to Sweep1 with recorded history and have it also working on a mirrored object.
Is there a way to accomplish that?
Thank you
For some strange reason as there is no history working for the sweeped geometry/pipe, if I start to tweak its curve Rhino says that I will break history. 
What you are doing breaks history, because the curve you edit, is a mirror and child of the right curve. So editing that curve on the right, will update the pipe, and update the mirror child of both the curve and the pipe.
In other words, mirroring objects, makes all the mirrors 1-1 parent-childs to the original objects. For example: the mirrored side pipe is not linked to the curve anymore, but linked to the pipe on the right.
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@Gijs Is this a feature request? would be great to have all recorded in one pipeline, similar to a stack of modifiers. But with modifiers it has to be in one consecutive pipeline as the modifiers will stack one over the other and determine the overall outcome/result. But simple enhanced history, that this would work would be nice, despite that the command would be broken in this case. So if there is a way to program that would be great. The opportunities are endless. 