Kernrechtsfrage
Whether the diploma could be refused by revoking the favorable exam decision after formal finality.
Extrahierter Entscheid
The exam decision could not be revoked because the trust generated by the commission's conduct outweighed the interest in strict legality.
Extrahierte Begründung
The candidate relied in good faith on the commission's proposal to repeat the exam privately; the commission itself caused the improper procedure, the public-interest defect was limited, and the candidate suffered irreversible detriment.