Multiple Of Same ID

$data = [
    'first_name' => 'Sally',
    'last_name' => 'Parker',
    'courses' => [
        [
            'id' => 10,
            '_joinData' => [
                'grade' => 80.12,
                'days_attended' => 30,
                'start' => '2016-01-01,
                'end' => '2016-02-01,
                
            ]
        ],
        [
        'id' => 10,
            '_joinData' => [
                'grade' => 90,
                'days_attended' => 11,
                'start' => '2017-01-01,
                'end' => '2017-02-01,
            ]
        ]
        // Other courses.
    ]
];
$student = $this->Students->newEntity($data, [
    'associated' => ['Courses._joinData']
]);