code: def is_all_field_none(self):
          
  
          if self._type_ is not None:
              return False
  
          if self._type_description is not None:
              return False
  
          if self._type_description_translated is not None:
              return False
  
          if self._instance_description is not None:
              return False
  
          if self._product_vat_exclusive is not None:
              return False
  
          if self._product_vat_inclusive is not None:
              return False
  
          if self._item is not None:
              return False
  
          return True
docs: :rtype: bool