I cannot create rooms using a modified wall type

[CBRF23]

Hi, 

I'm having a very troublesome problem where anytime I modify a wall definition I cannot seem to create a room!   

Please see the attached plan.  I'm working in X9.  I created a new wall definition by copying the exterior siding-6 wall type.   

I've drawn an enclosed space, but cannot create a room to define the space!!

 

Any help or advice is much appreciated.  Has anyone else run into a similar problem?

No Room.zip

[CBRF23]

That did it.  Thank you solver!!