The reserve of the title until the full payment of the price (Pactum reservati domini donec praetium solvitur) under the civil and then commercial sale contract had a vertiginous development in the 19th and 20th centuries. As it was not expressly regulated in the Civil Code or the Commercial Code, a wide range of solutions had been released over time – from challenging the validity of this clause by jurisprudence and doct...

The study analyzes the new legal instrument of datio in solutum in terms of the extent to which it subsumes the regulatory framework existing in the matter of mortgages, on taking over the mortgaged movable good on the receivable account, presenting “in mirror” this similar mechanism and convergence, respectively divergence between the two institutions.