Questione giuridica chiave
Whether the appeal had to be entered into despite late payment of the advance on costs.
Decisione estratta
No; the appeal could not be entered into because the advance was paid only after expiry of the final deadline.
Motivazione estratta
After a warning under Art. 62(3) BGG and a non-extendable grace period, late payment triggered non-entry under Art. 108(1)(a) BGG.