1 . OFFICIALS - TAX ON SALARIES - ABATEMENT FOR DEPENDENT CHILD - CONDITIONS FOR GRANT - GRANT TO BOTH HUSBAND AND WIFE , BOTH BEING OFFICIALS - EXCLUSIONS BASED ON PURPOSE OF ABATEMENT AND NON-CUMULABLE DEPENDENT-CHILD ALLOWANCE ( STAFF REGULATIONS OF OFFICIALS , ANNEX VII , ART 2 ( 6 ); REGULATION NO 260/68 OF THE COUNCIL , ART . 3 ( 4 ), SECOND SUBPARA .) 2 . OFFICIALS - TAX ON SALARIES - INDEPENDENT SYSTEM - EQUALITY OF TREATMENT - LIMITS - POSSIBLE INEQUALITIES ARISING FROM OVERLAPPING OF COMMUNITY AND NATIONAL TAX SYSTEMS - NO RELEVANCE ( REGULATION NO 260/68 OF THE COUNCIL )