Question juridique clé
Whether the appeal could be entered into despite non-payment of the required cost advance within the prescribed deadline.
Solution extraite
No. Because the advance payment was not made even during the non-extendable grace period, the Supreme Court had to refuse to enter into the appeal.
Motifs extraits
Under Art. 62(3) BGG, failure to pay the required advance within the set time limit, including any grace period, leads to non-entry.