Key legal question
Whether the claim for repayment of extraordinary fees is contractual or based on unjust enrichment, and thus which limitation period applies.
Extracted holding
The file did not allow the federal court to determine the legal nature of the repayment claim; further factual findings were needed to decide whether the claim was contractual or unjust-enrichment based.
Extracted reasoning
The lower court had not established whether the fees were voluntarily paid after invoicing or directly deducted without the claimant's knowledge. That factual distinction is decisive for prescription.