Questione giuridica chiave
Whether the constitutional complaint was admissible despite the availability of an ordinary federal appeal on the same issues.
Decisione estratta
The complaint was not admissible to the extent it raised points that could be reviewed by ordinary federal appeal, in particular the active standing and interpretation of the contribution agreement.
Motivazione estratta
The subsidiary constitutional complaint cannot be used to challenge errors of ordinary federal law that are open to another federal remedy.