SonataAdminBundle/Resources/config/doctrine_orm.xml

<?xml version="1.0" encoding="UTF-8" ?>

<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>

        <service id="sonata.admin.manager.orm" class="Sonata\AdminBundle\Model\ORM\ModelManager">
            <argument type="service" id="doctrine.orm.default_entity_manager" />
        </service>

        <service id="sonata.admin.builder.orm_form" class="Sonata\AdminBundle\Builder\ORM\FormContractor">
            <argument type="service" id="form.factory" />
        </service>

        <service id="sonata.admin.builder.orm_list" class="Sonata\AdminBundle\Builder\ORM\ListBuilder" />

        <service id="sonata.admin.builder.orm_show" class="Sonata\AdminBundle\Builder\ORM\ShowBuilder" />

        <service id="sonata.admin.builder.orm_datagrid" class="Sonata\AdminBundle\Builder\ORM\DatagridBuilder">
            <argument type="service" id="form.factory" />
        </service>

    </services>
</container>