def set_outgoing(self, value):
        """
        Setter for 'outgoing' field.
        :param value - a new value of 'outgoing' field. Must be a list of IDs (String type) of outgoing flows.
        """
        if not isinstance(value, list):
            raise TypeError("OutgoingList new value must be a list")
        for element in value:
            if not isinstance(element, str):
                raise TypeError("OutgoingList elements in variable must be of String class")
        self.__outgoing_list = value