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Before submitting the declaration, the declarant should register a guarantee with the Customs Dispatch Office.
The guarantee should be equal to the revenue at risk. The declarant can then submit the declaration in the MCMS.

When submitting a warehousing Declaration, it is essential that the items are properly itemized. MCMS operates a warehousing stock keeping module in order to provide the Customs with the information about stocks in all warehouses. For this module to operate successfully, it is essential that all goods exiting the warehouse use the same units of measure and descriptions that were used during the admission into the warehouse.