Kernrechtsfrage
Whether the filing against the advance-payment order was an admissible public-law appeal before the Federal Supreme Court.
Extrahierter Entscheid
The filing was not to be treated as a public-law appeal; it was construed as a request to reduce the advance-payment demand and referred to the Federal Administrative Court.
Extrahierte Begründung
The complaint lacked sufficient reasoning, the interim order gave no reasons on the amount, and a direct appeal would make the Federal Supreme Court the first instance on the issue. The proper route was first to address the issuing authority.