Questione giuridica chiave
Whether the appeal could be entertained despite non-payment of the court advance within the extended deadline.
Decisione estratta
The appeal could not be heard because the advance was not paid even during the grace period.
Motivazione estratta
Under Art. 62(3) BGG and Art. 108(1)(a) BGG, failure to pay the advance after a deadline extension leads to non-entry in simplified procedure.