Doctrine2 innerJoin between two tables without defined association

I'm trying to join a table that doesn't have any association defined in my config file. What for? Because I don't want to pollute this object (section), because many other entities can be associated with this with a many-to-one relationship. So, I am defining the relation from one side only, so it doesn't pollute my section object.

What I am trying to do is:

// Find all sections with this bundle linked
$query = $this->getEntityManager()->getRepository('CompanyBackendSectionBundle:Section')->createQueryBuilder('s')
          ->select('s', 'st')
          ->innerJoin('s.translations', 'st')
          ->innerJoin('s.sectionBundles', 'sb')
          ->innerJoin('Company\Backend\FaqBundle\Entity\FaqQuestion', 'fq')
          ->where('st.locale = :locale')
          ->andWhere('sb.bundle = :bundleId')
          ->orderBy('st.name')
          ->setParameters(array(
              'locale' => $this->getLocale(),
              'bundleId' => $bundle->getId()
          ));

      

        
        
        
      

    

The problem is: -> innerJoin ('Company \ Backend \ FaqBundle \ Entity \ FaqQuestion', 'fq') ", I got:

[Semantical Error] line 0, col 179 near 'fq WHERE st.locale': Error: Identification Variable Company\Backend\FaqBundle\Entity\FaqQuestion used in join path expression but was not defined before.

      

        
        
        
      

    

Is there a way to do this other than using Doctrine Native Query?