Questão jurídica principal
Whether the repayment order was invalid because it was issued by the pension-paying compensation fund rather than the IV office.
Decisão extraída
The formal defect did not amount to nullity; under the circumstances the repayment order remained valid.
Fundamentação extraída
Although the IV office was materially competent, the compensation fund's lack of competence was not an ex officio nullity ground. The repayment followed the pension revocation, which itself referred to a separate repayment duty and was otherwise formally flawless.