Cautio de rato und naturale debitum bei Venuleius D.46,8,8,1

Abstract Cautio de rato und naturale debitum in Venuleius D.46,8,8,1. Venuleius deals with a unique case of naturalis obligatio: If a debtor, when paying to a an agent of the creditor, obtains a guarantee of approval by the creditor, he thereby indirectly recognises the claim and can therefore no longer invoke that the claim did not exist in reality, even if he defeats the creditor in a later trial.