Questione giuridica chiave
Whether the mooring concession services were exempt as acts performed in the exercise of public authority under Art. 17(4) OTVA.
Decisione estratta
No. The company and the concessioning municipalities acted on a contractual basis, without coercive public-law decisions; the services were therefore taxable.
Motivazione estratta
Public authority requires coercive decision-making under a statutory delegation and non-commercial, non-substitutable activity. Those conditions were absent, and port services were listed as taxable activities.