There is no link between the 8000-number for ACI S10 Supplementary filing and the eHBL 8000 Cargo Control Number. The 8000-number for the ACI S10 filing is only used as a shipment reference number, while the 8000 number of the eHBL filing is the CCN used for Customs Release Request. ACI S10 Supplementary data can still be filed until June 4, 2021, but eHBL data filing is mandatory from January 4, 2021.