[rules-users] [drools-planner] eval check doesn't provide the expected output

Hi, I have the following rule and roomCurriculumCode and currCode are of type String. If the check is equals "insertLogical" never happens, but if the the codes are not equal as expressed below the "insertLogical" is performed even if the strings are equal. What am I missing here rule "RoomAndCurriculum" when $room : Room($roomCode : code, $roomCapacity : capacity, $roomCurriculumCode : curriculumCode); $curriculum : Curriculum($currCode : code); eval($roomCurriculumCode != $currCode) then insertLogical(new IntConstraintOccurrence("RoomAndCurriculum", ConstraintType.NEGATIVE_HARD, 1, $roomCapacity, $room, $currCode, $roomCurriculumCode)); end -jd