Mysql composite unique key

First We have created Table:

CREATE TABLE IF NOT EXISTS `userlist` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `Listname` varchar(50) NOT NULL,
  `Listval1` varchar(50) NOT NULL,
  `Listval2` varchar(50) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;


Next Execute this query:

ALTER TABLE `userlist` ADD UNIQUE KEY (Listname,Listval1);

Insert Rows:

 INSERT INTO `tiketsoft`.`userlist` (`id`, `Listname`, `Listval1`, `Listval2`) VALUES (NULL, 'country', 'India', 'IN');

same record insert again its display below message

#1062 - Duplicate entry 'country-India' for key 'Listname'

Same time execute below query run successfully:

INSERT INTO `tiketsoft`.`userlist` (`id`, `Listname`, `Listval1`, `Listval2`) VALUES (NULL, 'country', 'China', 'Ch');