So it took me quite a while to figure out that there was a solution offered in this thread, so I might pose my interpretation of the solution in different terms before offering another version of the problem I am running into. Here goes. You have a wall in Phase 0 with a door in it. in phase 3 you are demoing the door. You go back to phase 0 to change the wall to an 'existing wall' type that you weren't using previously. It gives you the error message. But, if you go to phase 3 and try to change the wall type, you can, because that is the same phase that the infill element for the door is being automatically created and will change both at the same time.
Here is the twist. You have 13 phases in your project expected to take 5 years to construct. you are adding and removing doors in the same wall multiple times before ultimately removing the wall altogether. I could not change the wall type without removing the second door from the wall altogether and putting it back into the project in a new wall, which isn't actually what we would be doing.
Why is this program always limiting your ability to design because the program itself is based on simple basic projects? So frustrating!!! I sick of spending all my time trying to find new, more clever workarounds for the programs failings!
