1 . OFFICIALS - RECRUITMENT - PROMOTION - APPOINTMENT TO A HIGHER CAREER BRACKET FOLLOWING AN INTERNAL COMPETITION - APPOINTMENT TREATED AS PROMOTION - CLASSIFICATION IN GRADE - APPLICABLE RULES OF THE STAFF REGULATIONS - RULES GOVERNING PROMOTION ( STAFF REGULATIONS OF OFFICIALS , ARTS 27 TO 34 , 45 AND 46 ) 2 . OFFICIALS - RECRUITMENT - ESTABLISHMENT AFTER PROBATIONARY PERIOD - PROMOTION - MINIMUM PERIOD OF SERVICE REQUIRED - SENIORITY AFTER THE PROBATIONARY PERIOD ( STAFF REGULATIONS OF OFFICIALS , ART . 45 ( 1 ), SECOND PARAGRAPH )