1 . SOCIAL SECURITY FOR MIGRANT WORKERS - BENEFITS - NATIONAL RULES AGAINST OVERLAPPING BENEFITS - INAPPLICABILITY TO PERSONS IN RECEIPT OF BENEFITS OF THE SAME KIND AWARDED UNDER REGULATION NO 1408/71 - ' ' BENEFITS ' ' OF THE SAME KIND - CRITERIA - IDENTICAL PURPOSE AND BASIS OF CALCULATION ( REGULATION NO 1408/71 OF THE COUNCIL , ARTICLE 12 ( 2 ) AND CHAPTER 3 ) 2.SOCIAL SECURITY FOR MIGRANT WORKERS - BENEFITS - OVERLAPPING - RIGHT ACQUIRED BY VIRTUE OF NATIONAL LEGISLATION ALONE - APPLICABILITY OF NATIONAL RULES AGAINST OVERLAPPING BENEFITS - LIMITS - COMMUNITY RULES MORE FAVOURABLE TO THE WORKER ( REGULATION NO 1408/71 OF THE COUNCIL , ARTICLE 12 ( 2 ) AND ARTICLE 46 ( 3 )) 3.SOCIAL SECURITY FOR MIGRANT WORKERS - FINANCIAL PROVISIONS - COMMUNITY RULES ON THE CONVERSION OF CURRENCIES - INAPPLICABILITY TO BENEFITS AWARDED ON THE BASIS OF NATIONAL LEGISLATION ALONE ( REGULATION NO 574/72 OF THE COUNCIL , ARTICLE 107 ) 4.SOCIAL SECURITY FOR MIGRANT WORKERS - FINANCIAL PROVISIONS - COMMUNITY RULES ON THE CONVERSION OF CURRENCIES - BENEFITS AWARDED PURSUANT TO COMMUNITY LAW - VARIATIONS IN THE RATES OF CONVERSION OF CURRENCIES - PERIODICAL RECALCULATION OF BENEFITS - OBLIGATION - ABSENCE ( REGULATION NO 1408/71 OF THE COUNCIL , ARTICLES 46 AND 51 ; REGULATION NO 574/72 OF THE COUNCIL , ARTICLE 107 )