The judgment in a case concerning the liability of Community officials for property tax made clear that a breach of the provisions of the PPI represented a breach of the obligations arising out of the Treaties (judgment of 24 February 1988, Commission v. Belgium , Case 260/86, ECR.
Ar spriedumu lietā attiecībā uz Kopienas ierēdņu atbildību par īpašuma nodokli tika paskaidrots, ka Protokola noteikumu pārkāpums ir līgumu saistību pārkāpums.