zeropower

Hi,I have a question....I want to add an AI unit，Set its ROE to “free" My code is as follows： local ah64d=RAT:New("RAT_AH64D") ah64d:SetTakeoff("air") ah64d:SetDeparture({"RAT_ZONE_1", "RAT_ZONE_2"}) ah64d:RAT:SetROE("free") ah64d:SetROT ("passive") ah64d:Spawn(10) but ai ROE always is "hold"...Where's my problem?