tI1 sI . I( ENillkI. AI ;kEEt1M'N1 N TATRIFFS A I'SANI T AI 'E-OCT. 30.31!)47 A71 negotiated with a government which has not become, or has ceased to be, a contracting party. The contracting party taking such action shall give notice to all other contracting parties and, upon request, consult with the contracting parties which have a substantial interest in the product concerned. Article XXVIII Modification of Schedules 1. On or after January 1, 1951, any contracting party may, by negotiation and agreement with any other contracting party with which such treatment was initially negotiated, and subject to consultation with such other contracting parties as the CONTRACTING PARTIES determine to have a substantial interest in such treatment, modify, &r cease to apply, the treatment which it has agreed to accord under Article II to any product described in the appropriate Schedule annexed to this Agreement. In such negotiations and agreement, which may include provision for compensatory adjust- ment with respect to other products, the contracting parties concerned shall endeavour to maintain a general level of reciprocal and mutually advantageous concessions not less favourable to trade than that provided for in the present Agreement. 2. (a) If agreement between the contracting parties primarily concerned cannot be reached, the contracting party which proposes to modify or cease to apply such treatment shall, nevertheless, be free tQ do so, and if such action is taken the contracting party with which such treatment was initially negotiated, and the other contracting parties determined under paragraph 1 of this Artiole to have a substantial interest, shall then be free, not later than six months after such action is taken, to withdraw, upon the expiration of thirty days from the day on which written notice of such withdrawal is received by the CONTRACTING PARTIBS,
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