Can't pick new references.

Sometimes, when I edit the sketch of an exisiting feature, I'm not
allowed to pick newreferences. I get the message: "References to
additional 3d geometry may not be made; please select again." When I
use Sketch>References (as per the help files), it does not allow me to
delete existing refs or add new ones.
As far as I know, it only happens when I make a copy of the feature
(i.e. mirror command).
So far, I've only come up with two ways to get around it. One is to
delete the feature entirely and recreate it--which is not good if the
feature is complicated or has children. The other is to use
Edit>References to replace one of the exisiting refs with the one I
want. But, sometimes I can't spare any of the existing refs.
What's going on? What specifically causes this lockout? I'd like to
know so I can avoid it or change my methods.
Reply to
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The easiest solution I know of is to delete the copy and recreate it after the original has been redefined, someone else might know a better way but that's all I've come up with so far. Replace isn't always an option, but that is the only other alternative that I'm aware of.
Reply to
Dan Richards
I have to correct myself here, there is an additional option which is to make the copy independent of the original and then redefine both as required.
Reply to
Dan Richards

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