Erroneous certification on the creditor’s copy of a payment order that no objection has been filed; duty to correct. Where the debtor in fact lodged timely and proper objection, the creditor cannot invoke the mistaken certificate to obtain continuation of enforcement. The enforcement office must revoke the erroneous attestation and refuse continuation, since an official error may not prejudice the debtor’s legal position. Any damage caused by the mistake is to be pursued, if at all, against the responsible officer; it does not confer rights against the debtor (consid. 1).