Genemu don't shows autocomplete on Sonata

Genemu don't shows autocomplete on Sonata

I'm trying to use genemu select2 autocomplete on a Sonata Admin with
synmfony 2.3.
I follow the instructions from here
https://github.com/genemu/GenemuFormBundle/blob/master/Resources/doc/jquery/select2/index.md
Genemu version "genemu/form-bundle": "2.2.*" => for Symfony 2.3 Bundle
added on Appkernel Assets of Select2 included on layout template
(overriding it)
Everything seems to be well configured, indeed if i use
genemu_jqueryselect2_country, it replace the data from de select with
countries... but not shows any autocomplete.
->add('codigo_postal', 'genemu_jqueryselect2_entity', array('label' =>
'Código postal', 'class' => 'MyBundle\CodigoPostal', 'property' =>
'codigo'))
Thanks