++++ SOCIAL SECURITY FOR MIGRANT WORKERS - UNEMPLOYMENT - BENEFITS UNDER THE LEGISLATION OF THE COMPETENT STATE - LIMITED AND CONDITIONAL PRESERVATION - DEPARTURE OF THE PERSON CONCERNED TO ANOTHER MEMBER STATE - BENEFITS UNDER THE LEGISLATION OF THAT STATE - REFUSAL BASED ON FAILURE TO FULFIL THE CONDITIONS LAID DOWN BY ARTICLE 69 OF REGULATION ( EEC ) NO 1408/71 - NOT PERMISSIBLE