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Can you post an example of one of these problematic OS:SubSurface definitions in your .osm file (CTRL-F in a text editor)? For a sub surface, one can leave blank its Outside Boundary Condition Object if its base surface faces the outdoors, for example. But for paired interzone base surfaces, 2x OS:SubSurfaces must also be paired and reference each other (each Outside Boundary Condition Object can't be left blank). OpenStudio will rely on setAdjacentSubSurface to accomplish this.

There is a bit more flexibility in native E+ as discussed here, but it looks like there's an error in the docs (there's no reason to reference an adjacent ceiling in there).

Can you post an example of one of these problematic OS:SubSurface definitions in your .osm file (CTRL-F in a text editor)? For a sub surface, one can leave blank its Outside Boundary Condition Object if its base surface faces the outdoors, for example. But for paired interzone base surfaces, 2x OS:SubSurfaces must also be paired and , i.e. reference each other (each Outside Boundary Condition Object can't be left blank). OpenStudio will rely on setAdjacentSubSurface to accomplish this.

There is a bit more flexibility in native E+ as discussed here, but it looks like there's an error in the docs (there's no reason to reference an adjacent ceiling in there).