Не работает ON DELETE CASCADE

CREATE TABLE IF NOT EXISTS `attributes` (
  `attr_id` INT(10) NOT NULL,
  `attr_type_id` INT(10) NOT NULL,
  `attr_group_id` INT(10) DEFAULT NULL,
  `name` VARCHAR(300) NOT NULL,
  PRIMARY KEY (`attr_id`),
  KEY `attr_type_id` (`attr_type_id`),
  KEY `attr_group_id` (`attr_group_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
CREATE TABLE IF NOT EXISTS `params` (
  `attr_id` INT(10) NOT NULL,
  `object_id` INT(10) NOT NULL,
  `value` VARCHAR(1000) NOT NULL,
  KEY `object_id` (`object_id`),
  KEY `attr_id` (`attr_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
CREATE TABLE IF NOT EXISTS `referencess` (
  `attr_id` INT(10) NOT NULL,
  `object_id` INT(10) NOT NULL,
  `reference` INT(10) NOT NULL,
  KEY `attr_id` (`attr_id`),
  KEY `object_id` (`object_id`),
  KEY `reference` (`reference`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 
--
-- Constraints for table `attributes`
--
ALTER TABLE `attributes`
  ADD CONSTRAINT `attributes_ibfk_1` FOREIGN KEY (`attr_group_id`) REFERENCES `attr_groups` (`attr_group_id`) ON DELETE SET NULL ON UPDATE NO ACTION;
 
 
--
-- Constraints for table `params`
--
ALTER TABLE `params`
  ADD CONSTRAINT `params_ibfk_1` FOREIGN KEY (`attr_id`) REFERENCES `attributes` (`attr_id`) ON DELETE CASCADE ON UPDATE NO ACTION,
  ADD CONSTRAINT `params_ibfk_2` FOREIGN KEY (`object_id`) REFERENCES `objects` (`object_id`) ON DELETE CASCADE ON UPDATE NO ACTION;
 
  
--
-- Constraints for table `referencess`
--
ALTER TABLE `referencess`
  ADD CONSTRAINT `referencess_ibfk_3` FOREIGN KEY (`reference`) REFERENCES `objects` (`object_id`) ON DELETE CASCADE ON UPDATE NO ACTION,
  ADD CONSTRAINT `referencess_ibfk_1` FOREIGN KEY (`attr_id`) REFERENCES `attributes` (`attr_id`) ON DELETE CASCADE ON UPDATE NO ACTION,
  ADD CONSTRAINT `referencess_ibfk_2` FOREIGN KEY (`object_id`) REFERENCES `objects` (`object_id`) ON DELETE CASCADE ON UPDATE NO ACTION;