Using a beta of 0.7, I can't filter by model name:
Related Field got invalid lookup: model_name
..openrem/remapp/views.py in dx_summary_list_filter
if requestResults.get('model_name') : f.qs.filter(generalequipmentmoduleattr__model_name=requestResults.get('model_name'))
However, it seems that we have been using
generalequipmentmoduleattr__model_name when the real field name is
manufacturer_model_name for some time - certainly in 0.6, and I have no problems there!
@David Platten - can you please check your installs for filter by model_name?