docs: def _check_transition_connection(self, check_transition):
          """Checks the validity of a transition connection
  
          Checks whether the transition is allowed to connect the origin with the target.
  
          :param rafcon.core.transition.Transition check_transition: The transition to be checked
          :return bool validity, str message: validity is True, when the transition is valid, False else. message gives
              more information especially if the transition is not valid
          """
          from_state_id = check_transition.from_state
          from_outcome_id = check_transition.from_outcome
          to_state_id = check_transition.to_state
          to_outcome_id = check_transition.to_outcome
  
          # check for connected origin
          for transition in self.transitions.values():
              if transition.from_state == from_state_id:
                  if transition.from_outcome == from_outcome_id:
                      if check_transition is not transition:
                          return False, "transition origin already connected to another transition"
  
          if from_state_id in self.states and to_state_id in self.states and to_outcome_id is not None:
              return False, "no transition from one outcome to another one on the same hierarchy allowed"
  
          return True, "valid"