code: def fixed_dependencies
        fixed_attrs = fixed_attributes
  
        filtered_dependency_attributes.each_with_object(Set.new) do |(key, value), fixed_deps|
          fixed_deps.merge(value) if fixed_attrs.include?(key)
        end.reject(&:saved?)
      end
docs: Returns fixed dependencies, which are the ones we can't move, because we wouldn't be able to save the data
  
   @returns [Set<InventoryRefresh::InventoryCollection>] all unique non saved fixed dependencies