Key legal question
Whether the appeal had to be entered into after the appellant paid the advance costs late.
Extracted holding
The appeal could not be entertained because the advance payment was made only after the non-extendable deadline had expired.
Extracted reasoning
The appellant was warned under Art. 62(3) BGG that failure to pay the advance costs within the non-extendable grace period would lead to non-entry. Since payment occurred after the deadline, non-entry followed under Art. 108(1)(a) BGG.