Django GenericRelation not working

I have the following model in my app, using the content-type django framework in version 1.6.1 :

class GenericMedia(models.Model):      limit           = models.Q(model = 'Image') | models.Q(model = 'Video') | models.Q(model = 'Other')      content_type    = models.ForeignKey(ContentType, limit_choices_to = limit)      object_id       = models.PositiveIntegerField()      content_object  = generic.GenericForeignKey('content_type', 'object_id')        def __unicode__(self):          return u"%s" % os.path.basename(self.content_object.url.name)        def instance(self):          return self.content_object.__class__.__name__      class Media(models.Model):      description     = models.CharField(blank = True, max_length = 500)      link            = models.URLField(blank = True)      genericFK       = generic.GenericRelation(GenericMedia, content_type_field='content_type', object_id_field='object_id')        class Meta:          abstract = True        def __unicode__(self):          return u"%s" % os.path.basename(self.url.name)        def save(self, *args, **kwargs):          super(Media, self).save(*args, **kwargs)          generic_link = GenericMedia(content_object = self)          generic_link.save()      class Image(Media):      imgW = models.PositiveSmallIntegerField()      imgH = models.PositiveSmallIntegerField()      url  = models.ImageField(upload_to = 'mediamanager', height_field = 'imgH', width_field = 'imgW')

Everythings works fine, excepts the GenericRelation in my abstract Media Class.

In django documentation it is said that :
If you delete an object that has a GenericRelation, any objects which have a GenericForeignKey pointing at it will be deleted as well.

But my problem is that when I delete an image (wich extends Media), the GenericMedia pointing to it is not deleted.
If anyone has a solution, thanks !

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