Constitutional complaint challenging administrative act for ultra vires action and violation of legality principles

The Austrian Constitutional Court declared the challenged administrative act ultra vires and unconstitutional, thereby establishing that the complainant prevailed in the constitutional complaint. The dispute concerned a specific administrative decision where the authority allegedly acted beyond its legal competence, violating the principle of legality in Austrian administrative law. The decisive legal basis relied upon was the provisions of the Austrian Federal Constitutional Law (B-VG) regarding the jurisdiction of the Constitutional Court to review the lawfulness of individual administrative acts, specifically focusing on the requirement that administrative measures must be grounded in valid legislative authority and must not infringe upon fundamental rights guaranteed by the constitution.