Dimension Reference Has Become Invalid

[lhanyok]

I am currently modifying some wall types in my project, which includes changing some of the thicknesses. I've had a couple of small errors pop up, mostly about joined elements that were affected by the change in thickness.

This last wall though, gives me an error message that "One or more dimension references have become invalid." I assumed it was talking about dimensions that referenced and instance of the wall, but when I checked, it was dimensions on a completely different wall type. Any ideas on why there would be a reference between a dimension and a different wall type?

Thanks,
Laura