FOSRestBundle parent/child resource problem

CAHAnnotationController.php

<?php

namespace ICC\ProposalBundle\Controller\Api;

use FOS\RestBundle\Controller\Annotations as FOSRest;
use FOS\RestBundle\Controller\Annotations\RouteResource;
use FOS\RestBundle\Controller\FOSRestController;
use Nelmio\ApiDocBundle\Annotation\ApiDoc;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * @RouteResource("cah-annotations")
 */
class CAHAnnotationController extends FOSRestController
{
    /**
     * Get single CAHAnnotation
     *
     * @ApiDoc(
     *   resource = true,
     *   description = "Gets a CAHAnnotation for a given id",
     *   output = "ICC\ProposalBundle\Entity\Annotation\CAHAnnotation",
     *   statusCodes = {
     *     200 = "Returned when successful",
     *     404 = "Returned when the CAHAnnotation is not found"
     *   }
     * )
     * @FOSRest\View()
     *
     * @param int $proposalId
     * @param int $annotationId
     * @return array
     *
     * @throws NotFoundHttpException when page not exist
     */
    public function getCahAnnotationAction($proposalId, $annotationId)
    {
        if (!($cahAnnotation = $this->container->get('annotation_manager')->get($annotationId))) {
            throw new NotFoundHttpException(sprintf('The resource \'%s\' was not found.', $annotationId));
        }

        return $cahAnnotation;
    }
}

ProposalController.php

<?php

namespace ICC\ProposalBundle\Controller\Api;

use FOS\RestBundle\Controller\Annotations as FOSRest;
use FOS\RestBundle\Controller\Annotations\RouteResource;
use FOS\RestBundle\Controller\FOSRestController;
use ICC\ProposalBundle\Entity\AbstractProposal;
use Nelmio\ApiDocBundle\Annotation\ApiDoc;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * @RouteResource("proposals")
 */
class ProposalController extends FOSRestController
{
    /**
     * Get single StandardProposal
     *
     * @ApiDoc(
     *   resource = true,
     *   description = "Gets a proposal for a given id",
     *   output = "ICC\ProposalBundle\Entity\AbstractProposal",
     *   statusCodes = {
     *     200 = "Returned when successful",
     *     404 = "Returned when the AbstractProposal is not found"
     *   }
     * )
     * @FOSRest\View()
     *
     * @param int $id
     * @return AbstractProposal
     *
     * @throws NotFoundHttpException
     */
    public function getProposalAction($id)
    {
        $proposal = $this->container->get('doctrine.orm.entity_manager')
            ->getRepository('ProposalBundle:AbstractProposal')
            ->findOneBy(array('id' => $id));

        if (!$proposal) {
            throw new NotFoundHttpException(sprintf('The resource \'%s\' was not found.', $id));
        }

        return $proposal;
    }
}

routing.yml

proposal:
    type: rest
    resource: ICC\ProposalBundle\Controller\Api\ProposalController
    name_prefix: api_

standard_proposal:
    type: rest
    resource: ICC\ProposalBundle\Controller\Api\StandardProposalController
    name_prefix: api_

cah_annotation:
    type: rest
    parent: standard_proposal
    resource: ICC\ProposalBundle\Controller\Api\CAHAnnotationController
    name_prefix: api_

StandardProposalController.php

<?php

namespace ICC\ProposalBundle\Controller\Api;

use FOS\RestBundle\Controller\Annotations as FOSRest;
use FOS\RestBundle\Controller\Annotations\RouteResource;
use FOS\RestBundle\Controller\FOSRestController;
use ICC\ProposalBundle\Entity\StandardProposal;
use Nelmio\ApiDocBundle\Annotation\ApiDoc;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * @RouteResource("standard-proposals")
 */
class StandardProposalController extends FOSRestController
{
    /**
     * Get single StandardProposal
     *
     * @ApiDoc(
     *   resource = true,
     *   description = "Gets a proposal for a given id",
     *   output = "ICC\ProposalBundle\Entity\StandardProposal",
     *   statusCodes = {
     *     200 = "Returned when successful",
     *     404 = "Returned when the StandardProposal is not found"
     *   }
     * )
     * @FOSRest\View()
     *
     * @param int $id
     * @return StandardProposal
     *
     * @throws NotFoundHttpException
     */
    public function getStandardProposalAction($id)
    {
        $proposal = $this->container->get('doctrine.orm.entity_manager')
            ->getRepository('ProposalBundle:StandardProposal')
            ->findOneBy(array('id' => $id));

        if (!$proposal) {
            throw new NotFoundHttpException(sprintf('The resource \'%s\' was not found.', $id));
        }

        return $proposal;
    }
}