Question juridique clé
Whether the case had to be remitted because the complainant was excluded from taking part in evidence on an essential point.
Solution extraite
The procedural defects were serious, and the court could not make a discretionary merits review to cure them; remittal was required.
Motifs extraits
When a party is excluded from the taking of evidence on a material issue, the defect is grave. The court had no discretion to forgo remittal, and no concrete interest in accelerating the proceedings outweighed the need for a proper hearing.