1 . PRELIMINARY RULINGS - REFERENCE TO THE COURT - CONDITIONS FOR WITHDRAWAL 2 . COMMUNITY LAW - DIRECT APPLICABILITY - CONCEPT - CONSEQUENCES FOR NATIONAL COURTS ( EEC TREATY , ART . 189 ) 3 . COMMUNITY LAW - PRECEDENCE - CONFLICTING NATIONAL LAW - AUTOMATIC INAPPLICABILITY OF EXISTING NATIONAL PROVISIONS - PRECLUSION OF VALID ADOPTION OF LEGISLATIVE MEASURES INCOMPATIBLE WITH COMMUNITY LAW 4 . COMMUNITY LAW - DIRECTLY APPLICABLE PROVISIONS - CONFLICT BETWEEN COMMUNITY LAW AND A SUBSEQUENT NATIONAL LAW - POWERS AND DUTIES OF NATIONAL COURT HAVING JURISDICTION - NON APPLICATION OF NATIONAL PROVISION EVEN IF ADOPTED SUBSEQUENTLY - INCOMPATIBILITY WITH THE TREATY OF ANY CONSTITUTIONAL PRACTICE RESERVING THE SOLUTION OF THE DISPUTE TO ANY AUTHORITY OTHER THAN COURT HAVING JURISDICTION .