Place that the clause has character of autonomy, the expressive, which is third respect to the contract, can use it only in in virtue a agreement with the credit e that, being direct ad extend the effects of the original pact compromise, not can derive from the mere intake of the obligation others perfected For facts conclusive, necessary a act respectful of the requirements of form imposed by art. 807 of the Italian Civil Code proc., Impayed the question if, as support o with reference to the assignment of credit, the clause remains effective a advantage of the debtor original and if these these can however oppose it to the expander.