MySQL 5.5 外键不能引用分区表主键

版本

Server version: 5.5.15-rel21.0 Percona Server with XtraDB (GPL), Release rel21.0, Revision 158

ALTER TABLE `zabbix`.`alerts`  
  ADD CONSTRAINT `c_alerts_7` FOREIGN KEY (`eventid`) REFERENCES `zabbix`.`events`(`eventid`) ON DELETE CASCADE
 

报错

Error Code: 1005
Can't create table 'zabbix.#sql-5fd_5d8700' (errno: 150)

SHOW ENGINE INNODB STATUS出来的结果中：

121115 15:53:25 Error in foreign key constraint of table zabbix/#sql-5fd_5d8700:
 foreign key (`eventid`) references `zabbix`.`events`(`eventid`) on delete Cascade:
Cannot resolve table name close to:
(`eventid`) on delete Cascade

events为分区表

检查过字段类型，长度，默认值，引擎，字符集都正常。

测试非分区表正常，难道这是一个BUG？