Condictio indebiti: respondent’s mistakes in making payments inexcusably slack: excusability not a requirement where claimant a medical scheme: respondent proved its impoverishment: if respondent enriched by services provided by appellant, latter should have counterclaimed with condictio indebiti. Prescription: actual or constructive knowledge necessary for prescription to start running that of board of trustees: appellant failed to prove that board had actual or constructive knowledge by relevant date.
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