Error 1452 Foreign Key Fails - mysql

Question

I am getting a 1452 error from MySQL. Here is the SQL I used to INSERT
INSERT INTO `Quote` (`QTE_id`, `USR_id`, `QTE_total`, `QTE_desc`, `QTE_dateCreated`, `QTE_dateModified`,`QTE_name`, `QTE_status`)
VALUES
(39, 2, NULL, 'desc', '2013-11-19 00:00:00', '2013-11-19 11:22:49', 'test', 'Active');
Cannot add or update a child row: a foreign key constraint fails (`dbNAME`.`Quote`, CONSTRAINT `USR_id1` FOREIGN KEY (`USR_id`) REFERENCES `users` (`USR_id`))
I am positive that the USR_id I am trying to put into the Quote table exists. Any ideas? A lot of the other questions on Stack Overflow did not answer my question.
Here is the Create syntax for the following tables I am trying to insert and relate (generated from Workbench):
CREATE TABLE `Quote` (
`QTE_id` int(11) NOT NULL AUTO_INCREMENT,
`USR_id` int(11) DEFAULT NULL,
`QTE_total` decimal(7,2) DEFAULT NULL,
`QTE_desc` text,
`QTE_dateCreated` timestamp NULL DEFAULT NULL,
`QTE_dateModified` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`QTE_name` varchar(255) DEFAULT NULL,
`QTE_status` varchar(30) DEFAULT NULL,
PRIMARY KEY (`QTE_id`),
KEY `USR_id1` (`USR_id`),
CONSTRAINT `USR_id1` FOREIGN KEY (`USR_id`) REFERENCES `users` (`USR_id`)
) ENGINE=InnoDB AUTO_INCREMENT=39 DEFAULT CHARSET=utf8;
And the User Table:
CREATE TABLE `Users` (
`USR_id` int(11) NOT NULL AUTO_INCREMENT,
`MGR_id` int(11) NOT NULL DEFAULT '0'
`REP_id` int(11) NOT NULL,
`USR_name` varchar(255) NOT NULL,
`USR_login` varchar(255) NOT NULL,
`USR_dateModified` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`USR_dateCreated` datetime NOT NULL,
`USR_role` enum('Salesperson','Manager') DEFAULT NULL,
PRIMARY KEY (`USR_id`,`MGR_id`,`REP_id`),
KEY `MGR_id_idx` (`MGR_id`),
KEY `REP_id_idx` (`REP_id`),
KEY `USR_login` (`USR_login`),
CONSTRAINT `MGR_id` FOREIGN KEY (`MGR_id`) REFERENCES `users` (`USR_id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `REP_id` FOREIGN KEY (`REP_id`) REFERENCES `representative` (`REP_id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8

Answer 1

I had to do a few small changes (change the users to Users, add a ',' at the end of line that defines MGR_id, remove the constraint for REP_id) to make the two CREATEs to work.
Here are the exact CREATEs:
CREATE TABLE `Users` (
`USR_id` int(11) NOT NULL AUTO_INCREMENT,
`MGR_id` int(11) NOT NULL DEFAULT '0',
`REP_id` int(11) NOT NULL,
`USR_name` varchar(255) NOT NULL,
`USR_login` varchar(255) NOT NULL,
`USR_dateModified` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`USR_dateCreated` datetime NOT NULL,
`USR_role` enum('Salesperson','Manager') DEFAULT NULL,
PRIMARY KEY (`USR_id`,`MGR_id`,`REP_id`),
KEY `MGR_id_idx` (`MGR_id`),
KEY `REP_id_idx` (`REP_id`),
KEY `USR_login` (`USR_login`),
CONSTRAINT `MGR_id` FOREIGN KEY (`MGR_id`) REFERENCES `Users` (`USR_id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
CREATE TABLE `Quote` (
`QTE_id` int(11) NOT NULL AUTO_INCREMENT,
`USR_id` int(11) DEFAULT NULL,
`QTE_total` decimal(7,2) DEFAULT NULL,
`QTE_desc` text,
`QTE_dateCreated` timestamp NULL DEFAULT NULL,
`QTE_dateModified` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`QTE_name` varchar(255) DEFAULT NULL,
`QTE_status` varchar(30) DEFAULT NULL,
PRIMARY KEY (`QTE_id`),
KEY `USR_id1` (`USR_id`),
CONSTRAINT `USR_id1` FOREIGN KEY (`USR_id`) REFERENCES `Users` (`USR_id`)
) ENGINE=InnoDB AUTO_INCREMENT=39 DEFAULT CHARSET=utf8;
With that in place the following two INSERTs worked:
mysql> INSERT INTO `Users` (`USR_id`, `MGR_id`) VALUES(2, 2);
Query OK, 1 row affected, 4 warnings (0.22 sec)
mysql> INSERT INTO `Quote` (`QTE_id`, `USR_id`, `QTE_total`, `QTE_desc`, `QTE_dateCreated`, `QTE_dateModified`,`QTE_name`, `QTE_status`) VALUES (39, 2, NULL, 'desc', '2013-11-19 00:00:00', '2013-11-19 11:22:49', 'test', 'Active');
Query OK, 1 row affected (0.22 sec)
I hope this helps.