Przedmiot umowy zmieniającej

The text seeks to answer the question of what is the subject of the amending agreement - the con-tract (legal act) or the relationship that arises as a result of its conclusion? According to the posi-tion defended, as a rule it will be the contractual relationship, not the contract (legal act). Such a view is supported by, among others, the possibility of concluding an amending agreement with re-spect to a non-contractual obligation relationship, as well as the possibility of concluding an amending agreement after an assignment of the receivable from the contract.