PUBLIC CONTRACTS OF THE EUROPEAN COMMUNITIES - IMPLEMENTATION OF PROJECTS FINANCED BY THE EUROPEAN DEVELOPMENT FUND IN THE ACP COUNTRIES - INVITATIONS TO TENDER OR MUTUAL AGREEMENT CONTRACTS - ELIGIBILITY OF APPLICANTS - REFUSAL OF THE COMMISSION TO DECIDE THE ELIGIBILITY OF AN UNDERTAKING - APPLICATION FOR A DECLARATION THAT A MEASURE IS VOID AND FOR FAILURE TO ACT - INADMISSIBILITY ( EEC TREATY , ART . 173 , SECOND PARA ., AND ART . 175 ; ART . 25 OF PROTOCOL NO 2 TO THE CONVENTION OF LOME OF 2 FEBRUARY 1975 )