All officers and employees for the city shall be entitled to reimbursement for expenses incurred for transportation, meals, lodging and incidentals necessarily incurred in the performance of their official duties in addition to such compensation as is otherwise provided. In case of any doubt as to the necessity for the incurring of any expense, the city manager shall determine whether such necessity existed and may allow, reject or modify any claim or item or items thereof. (Prior code § 1355)