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Alors si j'ai compris (toujours pas sûr), il te faut un getter (voire un setter)

Exemple dans Order.php

            'shipping_number' => array(
                'getter' => 'getWsShippingNumber',
                'setter' => 'setWsShippingNumber'
            ),

...

    public function getWsShippingNumber()
    {
        $id_order_carrier = Db::getInstance()->getValue('
                        SELECT `id_order_carrier`
                        FROM `'._DB_PREFIX_.'order_carrier`
                        WHERE `id_order` = '.(int)$this->id);
        if ($id_order_carrier) {
            $order_carrier = new OrderCarrier($id_order_carrier);
            return $order_carrier->tracking_number;
        }
        return $this->shipping_number;
    }