Question juridique clé
Whether the public-law appeal against the cantonal decision on admissibility of opposition in bill-of-exchange proceedings was admissible in part beyond annulment
Solution extraite
The appeal could only seek annulment; the request for a declaration that the opposition was admissible was inadmissible.
Motifs extraits
In a public-law appeal, the Federal Court generally cannot substitute its own decision; only annulment may be sought, absent an exception not present here.