Kernrechtsfrage
Whether the complaint met the requirements for a second exchange of written submissions
Extrahierter Entscheid
No second written exchange was warranted because no response had been sought from the IV office and the appellant could already have raised his arguments in the complaint.
Extrahierte Begründung
A further exchange is not meant to introduce arguments that should have been made in the initial filing; no new procedurally relevant issues arose.