[FLOW3-general] wrong identifiers in selectboxes after update of flow-2.0.x-dev

[Wasko]

Hi,

since the last update of flow-2.0.x-dev via composer there is the 
following problem in my selectboxes:

before update:
..
<option value="1">Apple</option>
<option value="2">Stone</option>
..

now:
..
<option value="31e05171-2b16-47e2-892e-b5f87fb5ab09">Apple</option>
<option value="f0b65495-d5a8-457e-8e2e-cbdb330bcf0c">Stone</option>
..


definition of primary-key in model:

     	 /**
	 * @var integer
	 * @ORM\id
	 * @ORM\Column(name="idnr")
      * @ORM\Column(type="integer")
	 * @ORM\GeneratedValue
	 * @ORM\Column(columnDefinition="INT(11) NOT NULL AUTO_INCREMENT UNIQUE")
	 */
	protected $idnr;

Table:
idnr   name
1	Apple
2	Stone
....

What's wrong?

THX