Kernrechtsfrage
Whether the reimbursement claim could still be challenged as forfeited in the waiver proceedings
Extrahierter Entscheid
No. The reimbursement decision had become final after the withdrawal of the objection, so forfeiture had to be raised in the reimbursement proceedings and could no longer be examined here.
Extrahierte Begründung
Forfeiture concerns the existence and extent of the claim and is a matter of substantive law. After finality, the waiver procedure is limited to good faith and hardship; non-consideration of forfeiture does not render the reimbursement decision void.