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That worked in Django < 1.6 but was untested and undocumented. There is a open ticket here.
For a workaround, you can do this:
ctype = ContentType.objects.get_for_model(Place)
pk_list = ItemOrigin.objects.filter(
content_type=ctype
).values_list('object_id', flat=True)
places = Place.objects.filter(pk__in=pk_list)
Source:stackexchange.com