A national court shall render a decision on recognising a decision on supervision measures within 20 working days of receiving the certificate and the decision. If, due to exceptional circumstances, it is impossible to render a final decision on recognition within the time limit provided by the preceding paragraph, or in the event of an appeal being filed within a further 20 working days, a national court must immediately notify the competent authority of the issuing State thereof, and state the reasons for the delay, as well as the expected date by which a decision on recognition will be rendered. If the certificate is incomplete or manifestly fails to correspond with the decision on supervision measures, a national court may postpone its decision on recognising the decision until the certificate is supplemented or corrected, or until a the expiry of reasonable time limit which a national court sets for such purpose on the competent authority of the issuing State.