code: def is_all_field_none(self):
          
  
          if self._user_alias is not None:
              return False
  
          if self._alias is not None:
              return False
  
          if self._counterparty_alias is not None:
              return False
  
          if self._status is not None:
              return False
  
          if self._sub_status is not None:
              return False
  
          if self._time_start_desired is not None:
              return False
  
          if self._time_start_actual is not None:
              return False
  
          if self._time_end is not None:
              return False
  
          if self._attachment is not None:
              return False
  
          return True
docs: :rtype: bool