Autocomplete and $form->getData()

[soerenmartius]

Hey, in Sf 2.3 i have a form

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->setMethod('POST')
            ->setAction($this->router->generate('applypie_search'))
            ->add('query', 'genemu_jqueryautocompleter_entity', array(
                'route_name' => 'applypie_ajax_header_search_autocomplete',
                'class' => 'Applypie\Bundle\PositionBundle\Entity\Position',
            ))

            ->add('search', 'submit', array(
                'attr' => array(
                    'class'       => 'appie-search-btn '
                ),
                'label' => 'Absenden'
            ))
        ;
    }

Whatever, the autocomplete function works great but if i submit the form field the Query field is always empty

die(var_dump($form->getData()->getQuery()));

always returns null.. if i switch the form field from genemu_jqueryautocompleter_entity to textm it works great.

Any Idea?