++++ 1 . FREE MOVEMENT OF GOODS - QUANTITATIVE RESTRICTIONS - MEASURES HAVING EQUIVALENT EFFECT - DIFFERENCE OF TREATMENT IN FAVOUR OF IMPORTED PRODUCTS - PERMISSIBLE ( EEC TREATY, ART . 30 ) 2 . COMMUNITY LAW - PRINCIPLES - EQUAL TREATMENT - APPLICATION BY A MEMBER STATE OF OBLIGATIONS ARISING FROM A HARMONIZING DIRECTIVE ONLY TO DOMESTICALLY-PRODUCED PRODUCTS - DISCRIMINATION WHICH MAY NOT BE RELIED ON BY TRADERS - COMMISSION' S OBLIGATION TO ACT