One-To-Many, Self-referencing association with Typo3 Flow and Doctrine 2

Task.php

<?php
namespace My\Package\Domain\Model;

use TYPO3\Flow\Annotations as Flow;
use Doctrine\ORM\Mapping as ORM;

/**
 * @Flow\Entity
 */
class Task {

    /**
     * @var \Doctrine\Common\Collections\ArrayCollection<\My\Package\Domain\Model\Task>
     * @ORM\OneToMany(mappedBy="parentTask")
     **/
    protected $relatedTasks;

    /**
     * @var \My\Package\Domain\Model\Task
     * @ORM\ManyToOne(inversedBy="relatedTasks")
     **/
    protected $parentTask;
}
?>