(1) The innkeeper may be released from liability in advance only to the extent that the sum involved exceeds the applicable maximum amount under section 702 (1). The innkeeper may not be released from liability even to this extent in the case that the loss, destruction or damage was caused intentionally or with gross negligence by the innkeeper or the helpers of the innkeeper or that it involves things the acceptance of which for safekeeping the innkeeper refused contrary to the provisions of section 702 (3).
(2) The release is only effective if the declaration of the guest has been issued in writing and if it does not include any other provisions.