In this case, the data importer shall cooperate with the data exporter to erase or rectify the data.</p> 8.5 Duration of processing and erasure or return of data <p>Processing by the data importer shall only take place for the duration specified in Annex I.B. After the end of the provision of the processing services, the data importer shall, at the choice of the data exporter, delete all personal data processed on behalf of the data exporter and certify to the data exporter that it has done so, or return to the data exporter all personal data processed on its behalf and delete existing copies.