Questione giuridica chiave
Whether the 11 September 2007 fee calculation became a legally valid and final administrative decision.
Decisione estratta
The 2007 invoice did not meet the formal requirements of a decision and, in any event, did not cover the rainwater fee.
Motivazione estratta
An invoice generally is not a decision; under §§ 19(2) and 21(1) VRG a decision must be designated as such and signed in a legally valid manner. The 2007 calculation lacked both a decision label and a valid signature. Moreover, it contained only wastewater, water supply and construction water items, not rainwater.