OBSERVED:
If WEST is set to be friends with EAST, and EAST is set to be friends with WEST, then doArtilleryFire and commandArtilleryFire cease to function.
Artillery units cannot then complete a fire mission. The artillery unit will attempt to raise it's barrel to fire, but something in Arma's engine stops it and nothing happens.
(If you go up to the artillery unit, you can see the barrel moves slightly, but then nothing else happens).
EXPECTED:
Artillery unit should fire on the co-ordinates fed into it with the appropriate magazine and number of shots. {F22880}