Art. 242 SchKG; distinction between vindicatory ownership claim and contractual claim for transfer of title; only a third party’s assertion of ownership over an asset drawn into the estate triggers the special procedure. A request that the bankruptcy estate honor a sale contract is not an Eigentumsansprache, but the invocation of a personal right to performance. The bankruptcy administration may still decide whether to perform the debtor’s contractual obligation under Art. 211 Abs. 2 SchKG; if it opts to enter the claim in the collocation scheme, this sufficiently indicates that it does not intend to perform the contract.