Article 20
1. Where, with respect to the particularity of a case, all or part of the claim cannot be recovered or precautionary measures cannot be taken within a reasonable time, the requested authority shall inform the applicant authority thereof and state the reasons. On the basis of the information received from the requested authority, the applicant authority may request the latter to re-open the procedure for recovery or for precautionary measures. That request shall be made within 2 months of the receipt of the notification of the outcome of that procedure, and shall be treated by the requested authority in accordance with the provisions applying to the initial request. 2. No later than at the end of each six-month period following the date of acknowledgement of the receipt of the request, the requested authority shall inform the applicant authority of the state of progress or the outcome of the procedure for recovery or for precautionary measures.