(1) If the policyholder has concluded the contract on account of which multiple insurance arose without knowing that multiple insurance arose thereby, he or she may demand that the contract concluded at a later date be rescinded, or the sum insured be reduced, also reducing the insurance premium proportionally to that share not covered by the earlier insurance.
(2) Subsection (1) also applies if multiple insurance arose on account of the fact that the insurable value decreased after the conclusion of several contracts of insurance. If several contracts of insurance were concluded in such cases, at the same time or with the consent of the insurers, the policyholder may only demand the pro rata reduction of the sums insured and of the premiums.