Kernrechtsfrage
Whether the federal complaint was admissible despite non-payment of the advance costs within the grace period.
Extrahierter Entscheid
No. Because the appellant neither paid the advance nor provided the required proof of timely payment, the complaint had to be declared inadmissible.
Extrahierte Begründung
After a warning under Art. 62(3) BGG, failure to satisfy the advance-cost obligation within the non-extendable period leads to non-entry under Art. 108(1)(a) BGG.