Article 423. Residual and non-reimbursable contracts

1. A contract by which a party must receive payment or other counter-payment for the performance of its duties shall be recompensable. 2. A contract by which one article of the Convention is recognized as free of charge 3. The treaty shall be presumed to be recompensable if the law, other legal acts, contains It is not the case that the treaty or the substance of the treaty does not follow otherwise.