importing shading devices , obstruction surfaces, through gbxml

[kerberg]

I am attempting to import a gbxml file that has some rooms and shading geometry. the zones for the room import well but the shading geometry , while it is visible in the preview window, fails to imports , the error log says : the file contains 1000 obstruction surfaces (1000 failed to import)
How can i import these obstruction surfaces from gbxml files? Any help is appreciated thanks Ethan