OrderCore override not applied

[Ractor]

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I tried to create override for classOrderCore, located in /classes/order/Order.php. The result I put in /override/classes/order/Order.php with following content:

class Order extends OrderCore {
    /**
     * Generates reference number.
     *
     * Overriten to have reference numbers numeric only.
     */
    public static function generateReference()
    {
    return strtoupper(Tools::passwdGen(9, 'NUMERIC'));
    }
}

After doing this nothing happened. Additionally I tried following (with the same unsuccesful result):

• Delete cache using backoffice
• Delete manually cache/cache_index.php
• Disable overrides, delete cache in the BO and cache/cache_index.php and enable overrides afterwards

Can you tell me, where could be the catch? I'm using Prestashop v. 1.6.1.18.

Thanks

[Ractor]

So the catch was pretty basic, as it usually is. I forgot to add <?php to the beginning of the file.