OF THE TRANSITIONAL PERIOD , OR IN THE SPECIAL PROVISION OF ARTICLE 13 OF REGULATION NO 14/64 WITH EFFECT , AS REGARDS THE PRODUCTS REFERRED TO BY THE REGULATION , FROM 1 NOVEMBER 1964 , HAS A DIRECT EFFECT IN THE RELATIONS BETWEEN THE MEMBER STATES AND THEIR SUBJECTS THROUGHOUT THE COMMUNITY AS FROM THE DATE PROVIDED FOR THE IMPLEMENTATION OF THE PROVISIONS IN QUESTION . AS THE COURT STATED IN ITS JUDGMENT OF 9 MARCH 1978 IN CASE 106/77 , AMMINISTRAZIONE DELLE FINANZE DELLO STATO V SIMMENTHAL S.P.A . ( 1978 ) ECR 629 P . 643 , RULES OF COMMUNITY LAW MUST BE FULLY AND UNIFORMLY APPLIED IN ALL THE MEMBER STATES FROM THE DATE OF THEIR ENTRY INTO FORCE AND FOR SO LONG AS THEY CONTINUE IN FORCE .
7 THE INTERPRETATION WHICH , IN THE EXERCISE OF THE JURISDICTION CONFERRED UPON IT BY ARTICLE 177 , THE COURT OF JUSTICE GIVES TO A RULE OF COMMUNITY LAW CLARIFIES AND DEFINES WHERE NECESSARY THE MEANING AND SCOPE OF THAT RULE AS IT MUST BE OR OUGHT TO HAVE BEEN UNDERSTOOD AND APPLIED FROM THE TIME OF ITS COMING INTO FORCE . IT FOLLOWS THAT THE RULE AS THUS INTERPRETED MUST BE APPLIED BY THE COURTS EVEN TO LEGAL RELATIONSHIPS ARISING AND ESTABLISHED BEFORE THE JUDGMENT RULING ON THE REQUEST FOR INTERPRETATION , PROVIDED THAT IN OTHER RESPECTS THE CONDITIONS ENABLING AN ACTION RELATING TO THE APPLICATION OF THAT RULE TO BE BROUGHT BEFORE THE COURTS HAVING JURISDICTION ARE SATISFIED .
8 AS THE COURT RECOGNIZED IN ITS JUDGMENT OF 8 APRIL 1976 IN CASE 43/75 GABRIELLE DEFRENNE V SOCIETE ANONYME BELGE DE NAVIGATION AERIENNE SABENA ( 1976 ) ECR 455 , IT IS ONLY EXCEPTIONALLY THAT THE COURT MAY , IN APPLICATION OF THE GENERAL PRINCIPLE OF LEGAL CERTAINTY INHERENT IN THE COMMUNITY LEGAL ORDER AND IN TAKING ACCOUNT OF THE SERIOUS EFFECTS WHICH ITS JUDGMENT MIGHT HAVE , AS REGARDS THE PAST , ON LEGAL RELATIONSHIPS ESTABLISHED IN GOOD FAITH , BE MOVED TO RESTRICT FOR ANY PERSON CONCERNED THE OPPORTUNITY OF RELYING UPON THE PROVISION AS THUS INTERPRETED WITH A VIEW TO CALLING IN QUESTION THOSE LEGAL RELATIONSHIPS .
9 SUCH A RESTRICTION MAY , HOWEVER , BE ALLOWED ONLY IN THE ACTUAL JUDGMENT RULING UPON THE INTERPRETATION SOUGHT . THE FUNDAMENTAL NEED FOR A GENERAL AND UNIFORM APPLICATION OF COMMUNITY LAW IMPLIES THAT IT IS FOR THE COURT OF JUSTICE ALONE TO DECIDE UPON TEMPORAL RESTRICTIONS AS REGARDS THE EFFECTS OF THE INTERPRETATION WHICH IT GIVES .
10 IT IS NECESSARY , HOWEVER , TO OBSERVE THAT WHERE THE CONSEQUENCE OF A RULE OF COMMUNITY LAW IS TO PROHIBIT , ON THE DATES AND WITH THE EFFECTS DESCRIBED ABOVE , THE LEVYING OF NATIONAL CHARGES OR DUES , THE SAFEGUARD OF THE RIGHTS CONFERRED UPON SUBJECTS BY THE DIRECT EFFECT OF SUCH A PROHIBITION DOES NOT NECESSARILY REQUIRE A UNIFORM RULE COMMON TO THE MEMBER STATES RELATING TO THE FORMAL AND SUBSTANTIVE CONDITIONS TO