Kernrechtsfrage
Whether the refusal to hear an additional witness violated the right to be heard
Extrahierter Entscheid
No violation: the requested testimony was unnecessary because the file already established the relevant facts and the offer of proof was not pertinent to the outcome.
Extrahierte Begründung
The appellate court may refuse evidence in anticipatory assessment when the fact is irrelevant, already established, or the evidence is unsuitable; here the witness could not add decisive information.