On the other hand, it also regulates the internal policy relationship between the contracting authority and the trustee and thus interferes with the trustee certain obligations (diligence, accounting, good faith, etc.). On the basis of the points examined above, it is easy to understand that the scope and scope of Section 23 are broad and that, therefore, the applicability of its provisions is subject to careful scrutiny of the examination and subject matter of an agreement and of the agreement itself. Therefore, in introducing a case within the scope of Section 23, account should be taken of the fact that the subject matter of the agreement or the examination of the agreement or the agreement itself is unlawful. The doctrine of “contractual effect” means that a contract is only a contract between the parties and no third party can bring a claim against it, i.e. a foreign party to a contract cannot take legal action. .