Questione giuridica chiave
Whether the public law appeal was admissible despite challenging only the main reasoning on standing and not the subsidiary prescription reasoning.
Decisione estratta
No. Because the cantonal court also relied on a sustainable subsidiary ground, the appellants had to challenge that ground as well; otherwise the appeal could not succeed.
Motivazione estratta
A decision with dual reasoning cannot be overturned if one independent, tenable ground remains unchallenged. The appellants attacked only the standing analysis and ignored prescription.