(b) The associate director, supervisory officers, actuaries, accountants, inspectors, examiners, experts, clerks, stenographers and other assistants who may be employed are entitled to receive from the workers' compensation fund their necessary expense while traveling on business of the commission. Travel reimbursement shall be paid in accordance with the travel guidelines established by the department of administration. All expenses shall be itemized and sworn to by the person who incurred the expense, and are subject to the approval of the executive director: Provided, That the expenses of the executive director shall be subject to the approval of the board of managers.