Problem with Linking Models

Hi I have problem with Linking Models. Application cannot see
conection between UserData and MainBook. But between User and UserData
it works well. Can you tell why it doesn't work?

class User extends AppModel{
var $name = 'User';

var $hasOne = array(
'UserData'=> array(
'className'=>'UserData',
'foreignKey'=>'user_id'
)
);

}

class UserData extends AppModel{
var $name = 'UserData';

var $hasMany = array(
'MainBook'=>array(
'className' => 'MainBook',
'foreignKey' => 'user_data_id'
)
);

var $belongsTo = array(
'User' => array(
'className' => 'User',
'foreignKey' => 'user_id'
)
);
}

class MainBook extends AppModel{
var $name = 'MainBook';

var $belongsTo = array(
'UserData' => array(
'className' => 'UserData',
'foreignKey' => 'user_data_id'
)
);
}

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