In [My profile] > [Hongkong Post Account] > [Comprehensive Deposit Account], you can choose the CDA number from the "My CDA" list on the left, and then click "Dissociate this CDA from EC-Ship" in the CDA detail section. Finally, click the "Dissociate" button in the confirmation dialog to complete the dissociation.
You cannot cancel the dissociation once the linkage is removed successfully. If you would like to associate the permit account again, please click the "CDA Association" function again.