Judicial principles and studies
Res judicata, Contract Characterization and Theory of Contract Reduction
A brief summary of how res judicata as a public-order defense operates, rules for characterizing contracts, and when the theory of contract reduction applies if an inducing condition is void.
Courts and procedure
Judicial principles and studies
Updated: 10 September 2026
Editorial summary of a judicial principle or decision; consult the source below and do not treat the firm as the author of the decision.
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A brief summary of how res judicata as a public-order defense operates, rules for characterizing contracts, and when the theory of contract reduction applies if an inducing condition is void.
Key points
- Subject
- Summary
- Practical significance
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Subject
- A res judicata plea considered part of public-order defenses may be raised at any stage by the parties and can be raised by the court sua sponte, as reflected in judicial practice (Tamyiz Rights 2340/2023, 5689/2023, 7136/2022). - Jurisprudence requires cumulative conditions under Article 41 of the Evidence Law for a res judicata plea, without those conditions being detailed here. - Where two actions rest on the same agreement but allege different breaches, res judicata conditions are not satisfied. - Contract characterization depends on the factual reality and the common intent of the contracting parties under Article 239 of the Civil Code; the court is not bound by parties' labels and has authority to weigh evidence under Articles 33 and 34 of the Evidence Law.
Summary
- The immediate purpose or motive and the lawful benefit intended by the parties are central to the contract's cause; under Article 166/1 of the Civil Code, a contract is void if it lacks a lawful benefit or has an unlawful cause. - A clause stripping a party of the right to access the judiciary is void, since the right to litigate is constitutionally protected (Article 101 of the Constitution) and cannot be waived by agreement. - Articles 164 and 397 provide for the nullity of a contract conditioned on a term contrary to public order or where the void condition was the motive to contract; if the void part was the driving motive, the theory of contract reduction does not apply. - If the obligations can be severed and the void part is nonessential, the valid portion remains; if the void part is essential to the parties' intent, the entire contract is void. - Where an original obligation was induced by a void condition (for example, payment in consideration of a void promise not to litigate), that obligation is void and restitution may follow under Articles 248 and 249 of the Civil Code, allowing recovery of paid amounts. - This content is a general educational summary and is not judicial text or legal advice.
Practical significance
- Parties and judges may invoke res judicata at any stage; focus should be on the substance of the dispute rather than contractual labels. - Contract drafters should avoid clauses that attempt to bar access to courts, as those are void. - When an unlawful condition was the motive for contracting, the contract or affected obligations may be annulled and restitution ordered.
Frequently asked questions
Subject?
- A res judicata plea considered part of public-order defenses may be raised at any stage by the parties and can be raised by the court sua sponte, as reflected in judicial practice (Tamyiz Rights 2340/2023, 5689/2023, 7136/2022). - Jurisprudence requires cumulative conditions under Article 41 of the Evidence Law for a res judicata plea, without those conditions being detailed here. - Where two actions rest on the same agreement but allege different breaches, res judicata conditions are not satisfied. - Contract characterization depends on the factual reality and the common intent of the contracting parties under Article 239 of the Civil Code; the court is not bound by parties' labels and has authority to weigh evidence under Articles 33 and 34 of the Evidence Law.
Summary?
- The immediate purpose or motive and the lawful benefit intended by the parties are central to the contract's cause; under Article 166/1 of the Civil Code, a contract is void if it lacks a lawful benefit or has an unlawful cause. - A clause stripping a party of the right to access the judiciary is void, since the right to litigate is constitutionally protected (Article 101 of the Constitution) and cannot be waived by agreement. - Articles 164 and 397 provide for the nullity of a contract conditioned on a term contrary to public order or where the void condition was the motive to contract; if the void part was the driving motive, the theory of contract reduction does not apply. - If the obligations can be severed and the void part is nonessential, the valid portion remains; if the void part is essential to the parties' intent, the entire contract is void. - Where an original obligation was induced by a void condition (for example, payment in consideration of a void promise not to litigate), that obligation is void and restitution may follow under Articles 248 and 249 of the Civil Code, allowing recovery of paid amounts. - This content is a general educational summary and is not judicial text or legal advice.
Practical significance?
- Parties and judges may invoke res judicata at any stage; focus should be on the substance of the dispute rather than contractual labels. - Contract drafters should avoid clauses that attempt to bar access to courts, as those are void. - When an unlawful condition was the motive for contracting, the contract or affected obligations may be annulled and restitution ordered.
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