Kernrechtsfrage
Whether the Federal Supreme Court could enter into the appeal despite non-payment of the cost advance within the extended deadline.
Extrahierter Entscheid
The appeal could not be heard because the appellant failed to pay the required advance costs even after the grace period.
Extrahierte Begründung
Under Art. 62(3) BGG, failure to pay the ordered advance costs within the set deadline, including any additional deadline, leads to non-entry under Art. 108(1)(a) BGG.