[CMT8.4.1.201211]When migrate one table which has two fk, one fk will be lost

1 There is one table which has two fk

CREATE TABLE `participant` (
`host_year` int(11) NOT NULL,
`nation_code` char(3) NOT NULL,
`gold` int(11) DEFAULT '0',
`silver` int(11) DEFAULT '0',
`bronze` int(11) DEFAULT '0',
PRIMARY KEY (`host_year`,`nation_code`),
KEY `nation_code` (`nation_code`),
CONSTRAINT `participant_ibfk_3` FOREIGN KEY (`host_year`) REFERENCES `olympic` (`host_year`) ON DELETE CASCADE,
CONSTRAINT `participant_ibfk_4` FOREIGN KEY (`nation_code`) REFERENCES `nation` (`code`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1

2 Do migration to new database.
3 Goto progress UI.
Actual result:
"participant_ibfk_4" will be lost.

Additional:
When run the three sql in csql ,it is ok.