1 . OFFICIALS - ADVERSE DECISION - DECISION NOT TO ESTABLISH A PROBATIONARY OFFICIAL - OBLIGATION TO STATE REASONS - PURPOSE - SCOPE - REVIEW BY THE COURT - LIMITS ( STAFF REGULATIONS , SECOND PARAGRAPH OF ART . 25 ) 2 . OFFICIALS - RECRUITMENT - NOTICE OF VACANT POST - PURPOSE - PROTECTION OF THE INTERESTS OF THE STAFF OF THE COMMUNITIES AND NOT OF EXTERNAL CANDIDATES - PROBATIONARY OFFICIAL ASSIGNED TO A POST DIFFERENT FROM THAT TO WHICH THE VACANCY NOTICE RELATES ( STAFF REGULATIONS , SECOND PARAGRAPH OF ART . 4 AND ART . 29 ( 1 ) 3 . OFFICIALS - RECRUITMENT - PROBATIONARY PERIOD - DURATION LAID DOWN IN THE STAFF REGULATIONS - EXTENSION WITH THE AGREEMENT OF THE PROBATIONARY OFFICIAL CONCERNED - INFRINGEMENT OF ARTICLE 34 ( 1 ) OF THE STAFF REGULATIONS - NONE ( STAFF REGULATIONS , ART . 34 ( 1 ))