when there is a dispute between the customs authorities and the importer as regards the valuation of the imported goods, on satisfaction of the conditions enumerated in sub-section (1), the authorities should make provisional assessment of customs duty under Section 18 of the Act. This expedites clearance, pending final adjudication on merits which may take time. This is also the mandate of the Board Circular No.38/2016 dated 22nd August, 2016. Any insistence and compulsion by the authorities that the importer should disclaim and forgo his statutory right under Section 18 of the Act would not be correct. Neither would it be right to reject the valuation as declared by the importer without reasonable doubt for certain reasons.