public static function remove_competency_from_plan($planid, $competencyid) {
        $params = self::validate_parameters(self::remove_competency_from_plan_parameters(), array(
            'planid' => $planid,
            'competencyid' => $competencyid,
        ));
        $plan = api::read_plan($params['planid']);
        self::validate_context($plan->get_context());

        return api::remove_competency_from_plan($params['planid'], $params['competencyid']);
    }