CMR is mandatory legislation and does not have to be agreed separately. In this regard, commercial agreements that violate the provisions of the CMR convention cannot be considered legally binding and are null and void.
Generally, the CMR convention does not apply to purely domestic transportation (cabotage transport). However, in Austria the convention has been assimilated into Austrian national legislation (§439a UGB), and thus also applies to domestic deliveries in Austria (venue of pick-up and hand-over are both in Austria). Liability is set at 8.33 SDR (Special Drawing Rights) and is roughly equivalent to €10/kg.