belongsTo custom condition does not work

gistfile1.php

<?php

// in LinkedinPerson
public $hasMany = array(
    'LinkedinRecommendation' => array(
        'className' => 'LinkedinRecommendation',
        'foreignKey' => false,
        'dependent' => true,
    ),
)

// in LinkedinRecommendation
public $belongsTo = array(
    'LinkedinPerson' => array(
        'className' => 'LinkedinPerson',
        'foreignKey' => false,
        'conditions' => array('LinkedinPerson.linkedin_id = LinkedinRecommendation.linkedin_id'),
    ),
);

// the find
$res = $this->LinkedinPerson->find('first', array('contain'=>array('LinkedinRecommendation'), 'conditions'=>array('LinkedinPerson.id'=>35)));

// have also tried
$res = $this->Person->find('first', array('contain'=>array('LinkedinPerson.LinkedinRecommendation'), 'conditions'=>array('LinkedinPerson.id'=>35)));
// but get error on relationship of LinkedinPerson to LinkedinRecommendation

CREATE TABLE linkedin_recommendations (
id int(11) NOT NULL AUTO_INCREMENT,
created datetime NOT NULL,
modified datetime NOT NULL,
linkedin_id varchar(80) DEFAULT NULL,
recommendation_id int(11) DEFAULT NULL,
recommendation_type varchar(80) DEFAULT NULL,
recommendation_text text,
recommender_name varchar(80) DEFAULT NULL,
PRIMARY KEY (id),
KEY idx_linkedin_id (linkedin_id)
) ENGINE=MyISAM AUTO_INCREMENT=46 DEFAULT CHARSET=utf8