Kernrechtsfrage
Whether the appeal had to be declared inadmissible because the advance on costs was not paid within the extended time limit.
Extrahierter Entscheid
Yes. Because the appellant failed to pay the advance on costs within the additional deadline, the appeal was inadmissible under Art. 62(3) LTF.
Extrahierte Begründung
Non-payment after a duly warned extension triggers inadmissibility; the defect was manifest, allowing summary disposal.