“duty” and “security of duty” are determined by the proper officer of customs for securing the payment of the deficiency, if any, between the duty as may be finally assessed or re-assessed, as the case may be, and the duty provisionally assessed. Therefore, we are also of the prima facie view, that the EDD is paid by an importer, pending finalization of provisional assessment for a specific purpose and its estimation based on differential duty as a measure and its continuation cannot be dependent on finalization of assessment. In other words, the duties of customs paid under any type of assessment i.e., provisional, re-assessment, final assessment etc., are in the nature of ‘duty’ as defined under Section 2(15) ibid, “Extra Duty Deposit” by its nature and as explained in the CBEC circular is in the nature of ‘deposit of certain sum’ in order to ensure timely submission of information by the importers under SVB investigation, for the purpose of expeditious finalization of provisional assessments made under Section 18 ibid. Though the quantum of EDD deposit is determined on the basis of declared value, such measure of the deposit cannot by itself convert its nature to be a ‘duty’. Further, such quantum of deposit has also been prescribed at 1% and at 5% depending upon the circumstances as prescribed in CBEC circular. Further, upon furnishing of required information by the importers the requirement of payment of EDD is dispensed with by CBEC, while continuing the imports under SVB to be assessed under provisional assessment. Therefore, it also transpires from the above, that payment of EDD is for a specific time period, during the pendency of provisional assessment on account of SVB investigation, and it is only for the purpose of submitting the requisite information by the importer for determination of duty that is finally to be assessed by the proper officer of customs under Section 18 ibid. At the most EDD can be kept as reserve or ‘advance’ being in the nature of ‘deposit’ which is obtained by Revenue as an ‘extra amount’, which could be adjusted with the duty finally determined (on account of valuation of related party transaction), in case the security obtained during provisional assessment is insufficient and the importer had not paid the differential amount due on account of finalization of provisional assessment. Even though, such deposits made in the form of EDD may be available for adjustment against the deficiency of finally determined duty, in the context of present case where in comparison to the provisionally assessed duty paid there is no case of insufficiency in the duty already paid, as the transaction values were accepted, the EDD amount is refundable. Further, since the purpose