Why are room separation lines always causing problems in groups?
I often get the following error message because of seemingly unrelated changes: Corresponding group members in different group instances diverge in the following respects: - different curves
It makes no difference whether the room separation lines are in a group with walls etc. or whether it is a group with only room separation lines.
Presumably related to this topic:
Room separation line update: Disallow join, aware of room bounding walls - Autodesk Community
You can find forum posts on the topic dating back to 2010. Please fix it already.
