Questione giuridica chiave
Whether the complaint was admissible for the party U. despite no participation below.
Decisione estratta
U. lacked standing because he had not participated in the cantonal proceedings and no entitlement to appeal was shown.
Motivazione estratta
The complaint did not demonstrate a protected interest of U. under the appeal rules, and a conditional 'eventual' appeal is incompatible with procedural law.