Key legal question
Whether the appeal had to be entered into despite non-payment of the required advance costs within the final deadline.
Extracted holding
No entry could be made because the appellant failed to pay the advance costs even within the non-extendable grace period.
Extracted reasoning
Under Art. 62(3) BGG and the summary procedure of Art. 108(1)(a) BGG, failure to pay the advance costs despite warning requires non-entry.