Have you checked to make sure the opening doesn't have a base offset above the level?

Yes, no offsets.

Split existing wall, demolish offending section instead of placing wall opening in later phase?

And make the wall with the opening without the room bounding parameter check.
Have you tried that yet?

How did you create the opening? Family or Wall Opening tool? (I'm assuming family since opening tool isn't phasable)

edit: Just confirmed this as working. Edit profile of the existing wall in the shape of the opening. Place another existing wall in the place of the opening and either edit the top constraint to match the opening height or attach top/bottom to the exist wall you edited profile of. Demolish wall.

This is similar to the split option but I think the edit profile is going to make it cleaner. Splitting always gives me the creeps, plus it would split all the way up so you'd be demolishing the entire height of the wall.

Splitting's creepy alright, but profile editing lastingly affects wall joins. Halloween thread anyone? What is the scariest thing you've ever done to a revit model? Trick or treat!!

Started one! :laugh:

Recreated 4 hours of lost work using a stitched Journal file. </iwin>

Hard to beat! We split up a revit model by copying it, deleting all the model elements and linking the original back in. That way we figured we could have one file for editing the model and one for doing the (extensive) annotations and make our deadline (coming up fast because of regular crashes in 32-bit XP). We thought we could bind the link once we were done. Turns out binding a linked file takes quite a bit of memory, and linked files and dimensions don't go well together, unless you are very carefull about them being loaded or not, and about deleting elements in the linked file. And even after the deadline work needed to continue, no time to go back and do a few day's work all over in one file. Felt a bit like i imagine riding two horses at once does: hope they don't stop cooperating. Took a few weeks before new pc's arrived, credits to Danijel and Theo for keeping those beast in line.

It occurs to me that I've sort of hijacked this thread. Stl, you good? Admins, any way to make a clean break? O, and maybe a way to post anonymously, otherwise I imagine the best stories will remain untold...