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Did you get the problem fixed? I bought Arma II from greenmangaming but then bought Arma II Operation Arrowhead on Steam. I read a long time ago that it's fine as long as I install both but for the life of me keep getting the same error message the OP got. I tried searching forums for this error message but for some reason could not find any topics about this but a google search landed me in this topic anyway. Sorry for the necro but probably better than starting a new topic about this error message.
Reminds me a lot of Eve Online and having other corporations go and do the dirty work to corporations that were trying to grief new corporations. Usually only escalated the situation between the griefers and the new corporation from what I remember but hey could be a lot of fun to put a bounty on a buddies head just for the lolz assuming you got all of his gear back to give back to him if he's really a buddy of yours.