invalid blank Outside Boundary Condition Object

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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, 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).