Question juridique clé
Whether the federal appeal is admissible despite non-payment of the requested advance on costs.
Solution extraite
The appeal is inadmissible because the appellant did not pay the advance within the additional deadline set under the Federal Supreme Court Act.
Motifs extraits
After expiry of the supplementary deadline, no payment had been received. Under Art. 62 para. 3 and Art. 108 para. 1 let. a LTF, this leads to non-entry.