Regarding CHOPSE, or Chris'
OFP Script Editor, the weapon class names are incorrect for Armed Assault. There may be other object names that are incorrect as well. Apparently, you can edit the data files manually, but I'm not versed enough to know what to do...yet.
As an alternative, JadeGear has published a freeware beta version of the same sort of product for Armed Assault.
JadeGear Script Edit