title: Could not determine access type for property "translations" in Symfony 3.2.* with Sonata admin project and Sonata translation bundle
body: <p>I have installed Sonata admin project in Symfony 3.2.* version.
  Components that are being used in my project from composer.json file are as following:</p>
  
  <p>composer.json file's package snippet</p>
  
  <pre><code>"require": {
          "php": "&gt;=5.5.9",
          "ext-pdo_sqlite": "*",
          "a2lix/i18n-doctrine-bundle": "^0.1.0",
          "a2lix/translation-form-bundle": "^2.1",
          "doctrine/doctrine-bundle": "^1.6",
          "doctrine/doctrine-cache-bundle": "^1.2",
          "doctrine/doctrine-fixtures-bundle": "^2.2",
          "doctrine/orm": "^2.5",
          "erusev/parsedown": "^1.5",
          "ezyang/htmlpurifier": "^4.7",
          "friendsofsymfony/user-bundle": "~2.0@dev",
          "incenteev/composer-parameter-handler": "^2.0",
          "sensio/distribution-bundle": "^5.0",
          "sensio/framework-extra-bundle": "^3.0.2",
          "sonata-project/admin-bundle": "^3.12",
          "sonata-project/doctrine-orm-admin-bundle": "^3.1",
          "sonata-project/translation-bundle": "^2.1",
          "stof/doctrine-extensions-bundle": "^1.2",
          "symfony/monolog-bundle": "^3.0",
          "symfony/polyfill-apcu": "^1.0",
          "symfony/property-access": "^3.2",
          "symfony/swiftmailer-bundle": "^2.3",
          "symfony/symfony": "^3.2",
          "twig/extensions": "^1.3",
          "twig/twig": "^1.28",
          "white-october/pagerfanta-bundle": "^1.0"
      },
      "require-dev": {
          "friendsofphp/php-cs-fixer"            : "^1.12",
          "phpunit/phpunit"                      : "^4.8 || ^5.0",
          "sensio/generator-bundle"              : "^3.0",
          "symfony/phpunit-bridge"               : "^3.0"
      },
  </code></pre>
  
  <p>Details</p>
  
  <p>I am using translation bundle. So in my form, for each field I am having that fields for two languages.
  The form is rendering with multi-language options perfectly. But when I submits the form, I am getting below error:</p>
  
  <blockquote>
    <p>Could not determine access type for property "translations".</p>
  </blockquote>
  
  <p>Stack Trace in <code>vendor\symfony\symfony\src\Symfony\Component\PropertyAccess\PropertyAccessor.php</code> at line 649</p>
  
  <pre><code>} elseif (self::ACCESS_TYPE_MAGIC === $access[self::ACCESS_TYPE]) {
          $object-&gt;{$access[self::ACCESS_NAME]}($value);
      } elseif (self::ACCESS_TYPE_NOT_FOUND === $access[self::ACCESS_TYPE]) {
          throw new NoSuchPropertyException(sprintf('Could not determine access type for property "%s".', $property));
      } else {
          throw new NoSuchPropertyException($access[self::ACCESS_NAME]);
      }
  </code></pre>
  
  <p>Environment</p>
  
  <p>Sonata packages</p>
  
  <pre><code>$ composer show sonata-project/*
  sonata-project/admin-bundle              3.12.0 The missing Symfony Admin ...
  sonata-project/block-bundle              3.3.0  Symfony SonataBlockBundle
  sonata-project/cache                     1.0.7  Cache library
  sonata-project/core-bundle               3.2.0  Symfony SonataCoreBundle
  sonata-project/doctrine-orm-admin-bundle 3.1.3  Symfony Sonata / Integrate...
  sonata-project/exporter                  1.7.0  Lightweight Exporter library
  sonata-project/translation-bundle        2.1.0  SonataTranslationBundle
  </code></pre>
  
  <p>Symfony packages</p>
  
  <pre><code>$ composer show symfony/*
  symfony/monolog-bundle     3.0.1  Symfony MonologBundle
  symfony/phpunit-bridge     v3.2.1 Symfony PHPUnit Bridge
  symfony/polyfill-apcu      v1.3.0 Symfony polyfill backporting apcu_* func...
  symfony/polyfill-intl-icu  v1.3.0 Symfony polyfill for intl's ICU-related ...
  symfony/polyfill-mbstring  v1.3.0 Symfony polyfill for the Mbstring extension
  symfony/polyfill-php56     v1.3.0 Symfony polyfill backporting some PHP 5....
  symfony/polyfill-php70     v1.3.0 Symfony polyfill backporting some PHP 7....
  symfony/polyfill-util      v1.3.0 Symfony utilities for portability of PHP...
  symfony/security-acl       v3.0.0 Symfony Security Component - ACL (Access...
  symfony/swiftmailer-bundle v2.4.2 Symfony SwiftmailerBundle
  symfony/symfony            v3.2.2 The Symfony PHP framework
  </code></pre>
  
  <p>PHP version</p>
  
  <pre><code>$ php -v
  # $ php -v
  PHP 5.6.20 (cli) (built: Mar 31 2016 14:56:44)
  Copyright (c) 1997-2016 The PHP Group
  Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
  </code></pre>