Kernrechtsfrage
Whether the complaint was admissible against the intermediate decision on recusal issues.
Extrahierter Entscheid
The lower court correctly treated the IV office's letter as an interlocutory decision and the filing as a complaint, because a decision on the requested recusal had to be issued.
Extrahierte Begründung
Interlocutory decisions on recusal are separately challengeable; this also applies when the alleged grounds are substantive in nature.