bool TEST(){
  unit u=GetTriggerUnit()
  IssueImmediateOrder(u,"cancel")
  u=null
}
....
  trigger t=new trigger
  TriggerRegisterAnyUnitEventBJ( t, EVENT_PLAYER_UNIT_RESEARCH_START )
  TriggerAddCondition(t,Condition(function TEST))
  t=null
.....