INTERNATIONAL AGREEMENTS - SECOND YAOUNDE CONVENTION - PROTOCOL NO 6 ON THE ADMINISTRATION OF COMMUNITY AID - AWARD AND PERFORMANCE OF PUBLIC WORKS CONTRACTS - RESPECTIVE ROLES OF THE ACP STATE AND THE COMMISSION - ACP STATE RESPONSIBLE FOR THE CONCLUSION AND IMPLEMENTATION OF CONTRACTS - LEGAL RELATIONSHIP BETWEEN AN UNDERTAKING WHICH SUBMITS A TENDER OR IS AWARDED A CONTRACT AND THE COMMISSION - NONE - CLAIM THAT THE COMMUNITY IS LIABLE - WHETHER PERMISSIBLE ( EEC TREATY , ARTS 178 AND 215 , 2ND PARAGRAPH ; SECOND YAOUNDE CONVENTION OF 29 JULY 1969 , PROTOCOL NO 6 , ART . 17 ( 1 ))