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(ii) Not to apply restrictions so as to prevent unreasonably the importation of any description of goods in minimum commercial quantities, the exclusion of which would impair regular channels of trade, or restrictions which would prevent the importation of commercial samples, or prevent compliance with patent, trademark, copyright, or similar procedures ; and (iii) To apply restrictions under this Article in such a way as to avoid unnecessary damage to the commercial or economic interests of any other Member. 4. (a) Any Member which is not applying restrictions under this Article, but is considering the need to do so, shall, before instituting such restrictions (or, in circumstances in which prior consultation is impracticable, immediately after doing so), consult with the Organization as to the nature of its balance-of-payments difficulties, alternative corrective measures which may be available, and the possible effect of such measures on the economies of other Members. No Member shall be required in the course of consultations under this sub-paragraph to indicate in advance the choice or timing of any particular measure which it may ultimately determine to adopt. (6) The Organization may at any time invite any Member which is applying import restrictions under this Article to enter into such consultations with it, and shall invite any Member substantially intensifying such restrictions to consult within thirty days. A Member thus invited shall participate in such discussions. The Organization may invite any other Member to take part in these discussions. Not later than two years from the day on which this Charter enters into force, the Organization shall review all restrictions existing on that day and still applied under this Article at the time of the review. (c) Any Member may consult with the Organization with a view to obtaining the prior approval of the Organization for restrictions which the Member proposes, under this Article, to maintain, intensify or institute, or for the maintenance, intensification or institution of restrictions under specified future conditions. As a result of such consultations, the Organization may approve in advance the maintenance, intensification or institution of restrictions by the Member in question insofar as the general extent, degree of intensity and duration of the restrictions are concerned. To the extent to which such approval has been given, the requirements of sub-paragraph (a) of this paragraph shall be deemed to have been fulfilled, and the action of the Member applying the restrictions shall not be open to challenge under sub-paragraph (d) of this paragraph on the ground that such action is inconsistent with the provisions of paragraph 2 of this Article.