Art. 136b and Art. 17 Abs. 2 SchKG; complaint against auction adjudication and start of the time limit; the complaint period begins on the day of the auction for the notified person. Where the auction notice is sent by registered mail, service is valid not only upon personal delivery to the addressee but also upon delivery to any person authorized under postal rules to receive registered mail (consid. 1). If such service is regular, a complaint filed more than one year after the auction is time-barred; the supervisory authority may not annul the auction notice where the complaint properly concerns only the office act of the adjudication (consid. 2).