This diploma thesis deals with § 297a of the General Civil Code of Austria, a legal regulation on property law, which was introduced by the third amendment to the General Civil Code in 1916. This provision provides an opportunity to enter a reference to the property on machines into the Austrian Land Register, if the Machine builds an accessory to the property but stands in someone else?s ownership than the property owner. This regulation was primarily introduced for the cases of purchase of machines with title retention. The reference in the land register folio of asset should primarily destroy the false impression of the machine as an accessory to the property caused by its close connection. In case of a failure of entering the reference into the Austrian Land Register, the machine is regarded as an accessory of the property and it can be jointly exploited (§ 252 EO) or sold (§ 1047 ABGB) with it. Those persons who acquire a right in such a case, can invoke the omission of the entry on the behalf of their rights. Besides the legislative history of § 297a Civil Code of Austria, this paper examined thoroughly all regulatory contents of this provision and the requirements of its application with reference to the recent case law and doctrine. In course of this analysis, the possibilities of an entry for machines which are owned by tenants of the property or were brought in by the property owner under a leasing contract were examined in detail.Another focus of this work lies on the consideration of the legal consequences of a failure to enter the reference into the Land Register. Of interest were in this context especially the requirements of good faith and the required protection of parties holding real rights in the various stages of the connection the machine to the property. Subsequently was also dealt with the procedural aspects which are of importance during an execution against the property owner.