As I was chugging away at my model today I came across a rather aggravating little trick within a wall's type properties. Maybe some of you know this already, maybe some don't but you learn something new everyday. Apparently within the wall's type properties, if your wall is set to a "Foundation" function you can't use a level above as the "Top Constraint."
Example: I can't have a 12" Concrete basement wall (with a "foundation" function) using the First Floor Level as a top constraint. You will get the "Top Constraint is invalid for the Level" error message, and boy is it aggravating! It must use the Basement Floor Level. Now I can offset it until my heart's desire but it can't associate with a level above.
Just a random factoid for the day!