It is likely that a pre-notification has been submitted for the visit via Vessel Notification, and that a notification of Ship’s Stores (STO) is now being made. The ship has not yet arrived for its visit and has dropped anchor instead. The ship’s stores are therefore being used – which means the quantities will be lower than predicted at the moment when the ship actually arrives. As a shipping agent and the person submitting the ship’s stores, you must then contact Customs via email@example.com. They can help you adjust the listed quantity to the actual quantity upon arrival.
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