Acquisition of property in the case of multiple contracting is an institute of right in rem (right of real property) which is regulated by the Law on Property and other real property rights. The forerunners of said law regulated this institute, while case-law impacted the development of contracting by including the principle of good faith as a fundamental condition in determining the owner. It is possible to multiply acquisit both movable and immovable property. The owner of the movable property will be the acquirer to whom the thing was handed first in free possession, while the owner of the immovable property will be the acquirer who was the first to request in good faith the registration of the ownership in land registry. Although land registry enjoys public faith, they are often incomplete and incorrect, so the real situation could differ from the one written in land-registry books. The legislator has given the protection to the acquirer who on the occasion of multiple contracting of the alienation of real estate could not register his right of ownership due to the registration of the acquirer who knew that the same real estate was justly alienated from the former one. This form of protection is called a quasi-action for cancellation of title.