High seas sale declarations by canalising agencies allow Import Department to process amendment applications upon specified certifications. High Seas sales by canalising agencies (public sector undertakings like MMTC and STC) will be processed by the Import Department without reference to other Customs sections where the agency furnishes an authorised declaration confirming no pending Custom House charges, absence of the item from the negative list, and genuineness of original overseas supplier invoices, together with disclosure of the commission in a stamped contract and a certified copy of the High Seas sales contract.