def is_all_field_none(self):
        """
        :rtype: bool
        """

        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
:rtype: bool