++++ Common commercial policy - Protection against dumping - Application for refund of anti-dumping duties based on Article 16 of Regulation No 2176/84 - Calculation of the actual dumping margins - Determination of the export price - Constructed export price - Allowances made for costs incurred between importation and resale - Deduction of anti-dumping duties - Legality - Difference in treatment between association importers and independent importers justified by the difference in their respective situations with respect to the dumping - Incompatibility with Article 2(5) of the GATT anti-dumping code - None (Council Regulation No 2176/84, Article 2(8)(b), and 16(1); Agreement on Implementation of Article VI of the General Agreement on Tariffs and Trade (the 1979 Anti-dumping Code), Art. 2(5))