# File app/models/smerf_item.rb, line 123
    def validate_object_fields
      # Setup fields array
      setup_fields()      
      # Check the sort order field
      errors = ""
      if !@sort_order_field.blank?()
        errors += validate_field(@item_data, @sort_order_field,
          "Specified group sort field '#{@sort_order_field}' missing from ")    
      end
      # Validate all fields
      errors += validate_fields(@item_data, @fields)        
      # Create a unique id for this object, which is a combination of onwer_id
      # and this objects unique code      
      @object_ident = (@owner_ident) ? "#{@owner_ident}~~#{@code}" : "#{@code}"
      
      object_index[@object_ident.to_s()] = self
      return errors
    end