It is not necessary to file double data or make two transmissions. The 8000 number used for filing the ACI S10 Supplementary data is solely for shipment reference and is not linked to the eHBL 8000 Cargo Control Number. If both the eHBL data set and Close Message are filed, the eHBL 8000 CCN will be used for the Customs release request, thus eliminating the need for ACI filing.