Questão jurídica principal
Whether Y. was unjustly enriched by the transfer and must restitute it under Art. 62 CO.
Decisão extraída
The restitution claim failed because the appellate findings did not establish the cause of the transfer; the burden of proving the factual basis for unjust enrichment was not met.
Fundamentação extraída
In a restitution claim based on a future or unfulfilled cause, the claimant must prove the payment and the purpose for which it was made. Here, the judgment did not establish what Y. was supposed to do with the money, so the allegedly non-realized cause was unproven.