(1) The rights of the buyer due to a defect are excluded if the buyer has knowledge of the defect at the time of conclusion of the contract. If the buyer has no knowledge of a defect due to gross negligence, the buyer may assert rights in relation to this defect only if the seller fraudulently concealed the defect or gave a guarantee as to the nature of the thing.
(2) A right entered in the Land Register is to be removed by the seller even if the buyer is aware of it.