Can someone please give me a tutorial on vertically compound walls? I'm getting errors all over the place when I try to attach a wall to my roof. The wall has the exterior sheathing and siding unlocked and extended vertically 8". My roof edge is aligned with the face of core. So the extended layers are supposed to cover the roof edge.
But when I try to attach the walls I get this error...
"Cannot extend layer(s) of the highlighted vertically compound wall"
I also get this when I try to trim two walls together. I've tried making sure the walls are exactly the same with the same top and base extensions, etc. But they just won't trim without giving me the error.
Attached is the roof will a chain of walls. When I tried to attach the walls some attached some didn't and if I select the ones that didn't and hit attach I get the error. Any ideas?
Thanks.
p.s. the only reference I can find to this on the forum is my own earlier post on the same topic. Hasn't anyone ever seen this error before? There must be a rule of thumb that I'm breaking but I don't know what it is.