Questione giuridica chiave
Whether the appeal was admissible despite non-payment of the advance on costs after the grace period.
Decisione estratta
The appeal could not be entered into because the advance on costs was not paid within the prescribed deadline or extended deadline, nor was proof of timely payment provided.
Motivazione estratta
Under Art. 62(3) BGG, failure to pay the required advance despite warning leads to non-entry under Art. 108(1)(a) BGG.