Questione giuridica chiave
Whether the federal complaint was admissible despite non-payment of the advance costs within the grace period.
Decisione estratta
No. Because the appellant neither paid the advance nor provided the required proof of timely payment, the complaint had to be declared inadmissible.
Motivazione estratta
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.