1 . SOCIAL SECURITY FOR MIGRANT WORKERS - UNEMPLOYMENT - BENEFITS - UNEMPLOYED PERSON GOING TO ANOTHER MEMBER STATE - ENTITLEMENT TO BENEFITS MAINTAINED - SYSTEM OF ARTICLE 69 OF REGULATION NO 1408/71 - OBJECTIVE 2 . SOCIAL SECURITY FOR MIGRANT WORKERS - UNEMPLOYMENT - BENEFITS - UNEMPLOYED PERSON GOING TO ANOTHER MEMBER STATE - ENTITLEMENT TO BENEFITS MAINTAINED - PERIOD OF THREE MONTHS - EXPIRY - LOSS OF ENTITLEMENT TO BENEFITS - EXTENT ( REGULATION NO 1408/71 OF THE COUNCIL , ART . 69 ( 2 )) 3 . SOCIAL SECURITY FOR MIGRANT WORKERS - UNEMPLOYMENT - BENEFITS - UNEMPLOYED PERSON GOING TO ANOTHER MEMBER STATE - ENTITLEMENT TO BENEFITS MAINTAINED - CONDITIONS AND LIMITS - COMPATIBILITY WITH THE PROVISIONS OF THE EEC TREATY ( EEC TREATY , ART . 51 ; REGULATION NO 1408/71 OF THE COUNCIL , ART . 69 ) 4 . MEASURES OF THE INSTITUTIONS - VALIDITY - INFRINGEMENT OF FUNDAMENTAL RIGHTS - ASSESSMENT IN THE LIGHT OF COMMUNITY LAW ALONE 5 . COMMUNITY LAW - GENERAL LEGAL PRINCIPLES - FUNDAMENTAL RIGHTS - RIGHT TO PROPERTY - PROTECTION WITHIN THE COMMUNITY LEGAL ORDER 6 . SOCIAL SECURITY FOR MIGRANT WORKERS - UNEMPLOYMENT - BENEFITS - UNEMPLOYED PERSON GOING TO ANOTHER MEMBER STATE - ENTITLEMENT TO BENEFITS MAINTAINED - PERIOD OF THREE MONTHS - EXTENSION - DISCRETIONARY POWER OF THE NATIONAL AUTHORITIES - LIMITS - PRINCIPLE OF PROPORTIONALITY ( REGULATION NO 1408/71 OF THE COUNCIL , ART . 69 ( 2 ))