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Question
Facts: A landowner engages a private 'Title Compliance Service' to obtain a 'Certificate of Title Compliance' required to finalize a land-title transfer. The service asserts that the certificate is mandated by a government regulation and charges PHP 520,000. The landowner pays in good faith. After the transfer, the landowner learns that no such regulation exists and that the service has retained the money. The landowner sues to recover the amount on the theory of solutio indebiti grounded on mistake of law. (a) Identify the controlling doctrine and its essential elements. (b) Is a mistake of law a valid basis for recovery under solutio indebiti, and how does this differ from a mistake of fact? (c) Apply to the facts: should the landowner be allowed to recover from the service, and what defenses might the service raise?