Question juridique clé
Whether the appeal in public law matters was admissible and the subsidiary constitutional complaint could be heard.
Solution extraite
The appellant asserted a potentially arguable right under Art. 50 AuG, so the public law appeal was admissible; the subsidiary constitutional complaint was inadmissible.
Motifs extraits
A potentially existing claim is sufficient for standing. Because the ordinary appeal was available, the subsidiary constitutional complaint was excluded.