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

        if self._billing_date 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._unit_vat_exclusive is not None:
            return False

        if self._unit_vat_inclusive is not None:
            return False

        if self._vat is not None:
            return False

        if self._quantity is not None:
            return False

        if self._total_vat_exclusive is not None:
            return False

        if self._total_vat_inclusive is not None:
            return False

        return True
def is_all_field_none ( self ) : if self . _billing_date 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 . _unit_vat_exclusive is not None : return False if self . _unit_vat_inclusive is not None : return False if self . _vat is not None : return False if self . _quantity is not None : return False if self . _total_vat_exclusive is not None : return False if self . _total_vat_inclusive is not None : return False return True
:rtype: bool