MySQL Forums :: Foreign Keys (Referential Integrity) :: Multiple column foreign key

I have two table named 'customers' and 'accounts' with following create definitions:

delimiter $$

CREATE TABLE `customers` (
`CID` int(10) unsigned NOT NULL,
`First_Name` varchar(30) NOT NULL,
`Last_Name` varchar(30) default NULL,
`Father_Name` varchar(45) default NULL,
`Address_Res` varchar(100) default NULL,
`Phone` varchar(60) default NULL,
`Mobile` varchar(60) default NULL,
`Comment` varchar(200) default NULL,
`Register_Date` datetime NOT NULL,
PRIMARY KEY (`CID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='Table to store Customer informatios'$$

delimiter $$

CREATE TABLE `accounts` (
`CID` int(10) unsigned NOT NULL,
`ACN` int(10) unsigned NOT NULL,
`Loan_Amount` int(10) unsigned NOT NULL,
`Interest_Rate` decimal(10,0) unsigned NOT NULL,
`Opening_Date` date NOT NULL,
`Closing_Date` date NOT NULL,
`Comment` varchar(200) default NULL,
`DB_Save_Date` datetime NOT NULL,
KEY `INDEX_Accounts_ACN` (`ACN`),
KEY `FK_Accounts` (`CID`),
CONSTRAINT `FK_Accounts` FOREIGN KEY (`CID`) REFERENCES `customers` (`CID`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=latin1$$

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Now I want to create another table 'Mortgages' with following definition

CREATE TABLE `bankpage_`.`Mortgages` (

`CID` INT UNSIGNED NOT NULL ,

`ACN` INT UNSIGNED NOT NULL ,

`Type` VARCHAR(45) NOT NULL ,

`Weight` DECIMAL UNSIGNED NOT NULL ,

`Mortgage_Date` DATE NOT NULL ,

`Release_Date` DATE NOT NULL ,

`IsSeized` TINYINT(1) NOT NULL ,

`Comments` VARCHAR(45) NULL ,

INDEX `FK_Mortgages` (`CID` ASC, `ACN` ASC) ,

CONSTRAINT `FK_Mortgages`

FOREIGN KEY (`CID` , `ACN` )

REFERENCES `bankpage_`.`accounts` (`CID` , `ACN` )

ON DELETE NO ACTION

ON UPDATE NO ACTION);

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On execution I am getting the following error:
ERROR 1005: Can't create table '.\bankpage_\mortgages.frm' (errno: 150)

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Please help me
I want to reference two columns of mortages table to accounts table