I try not to think too much, it hurts ! But don't you think there should be some distinction from a unit CAing from within a building and in the open? IMO they should not be treated the same. Like I mentioned already, they should be capable of it but at reduced effectiveness.
But anyways, based on poesels screenie, it is possible. Apparently at reduced effectiveness and certainly at reduced frequency. Since at least I don't ever recall seeing it myself.