Kernrechtsfrage
Whether the Federal Supreme Court could review the cantonal consent to nullity under Art. 41 BüG and whether non-service of that consent invalidated the proceeding.
Extrahierter Entscheid
The cantonal consent under Art. 41 BüG is not itself a decision that must be served on the applicant; only the Federal Office's nullity decision is legally operative.
Extrahierte Begründung
The cantonal consent is only a necessary prerequisite for the Federal Office's decision, not a sufficient one. It does not itself alter rights and duties under Art. 5 VwVG, so no separate notification was required.