Question juridique clé
Whether the appeal is admissible despite non-payment of the advance on costs within the additional deadline.
Solution extraite
No. Because the advance on costs was not paid within the non-extendable additional deadline, the appeal had to be declared inadmissible.
Motifs extraits
Under Art. 62(3) BGG, failure to pay the requested advance on costs within the additional deadline leads to inadmissibility; the court also applied the cost rule in Art. 66(1) BGG.