(1) If no specific means of transport has been agreed for the forwarding of the goods, the policyholder, insofar as he or she has any influence thereon, is obliged to use a means of transport which is suited to taking on board and transporting the goods.
(2) If the policyholder breaches this incidental obligation intentionally, or by acting with gross negligence, the insurer is not liable, unless the breach was not the cause of the occurrence of the insured event or of the extent of the liability.
(3) If the policyholder learns of the unsuitability of the means of transport, he or she must notify the insurer of that fact without undue delay. Section 132 applies.