Mistake of Law as Basis for Solutio Indebiti

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1. Article 2155 recognizes possible solutio indebiti when payment results from what legal mistake?
2. Does Article 2155 mean every claim of ignorance of law automatically excuses compliance with legal duties?
3. Besides the qualifying mistake, what must the claimant establish under Article 2154?
4. A payer misconstrues a genuinely difficult legal provision and, because of that error, pays a sum the recipient had no …
5. A payer was in doubt whether a debt was due and later proves it was not due. What does Article 2156 provide?
6. A lessee consistently believes a rental increase is invalid, protests it from the start, but deliberately pays while it…
7. A payer proves a genuine difficult-law misunderstanding but the court finds that, correctly applying the law, the exact…
8. Reconcile Article 3's ignorance-of-law rule with Article 2155's legal-mistake provision.
9. Explain why a subsequent judicial ruling against a charge does not, without examining the facts, prove that earlier pay…
10. State what must be proved for a refund based on Article 2155, and distinguish the payer-in-doubt situation covered by A…
11. For Article 2155, must the legal misunderstanding have caused the payment, rather than merely be discovered in an unrel…
12. Does an accountant’s addition error, without any misunderstanding of law, become a mistake of law merely because the su…