Can't delete exterior trims on rounded room corners

[Cake]

Hello,

I am currently building a house with a large rounded balcony and decided I no longer like the exterior trim I put on it. However, I am unable to delete exterior trim on the rounded corners- it says there is nothing to delete. I have tried re-building the balcony, deleting rooms, etc., and nothing seems to work. I have run into this issue with previous builds. Any help or suggestions would be appreciated.

[Pam]

I'm moving this to the Building and Construction board.