Questione giuridica chiave
Whether the appeal must be entered into despite failure to pay the ordered advance on costs within the deadline.
Decisione estratta
No entry is made because the advance on costs was not paid or duly evidenced within the non-extendable grace period.
Motivazione estratta
After the warning under Art. 62(3) BGG, the appellant neither paid the CHF 1,500 advance nor produced the required proof of timely debit; non-entry follows under Art. 108(1)(a) BGG.