Detail to Higher Grade

An Authorizing Certifying Officer for the Maritime Administration, requested an advance decision with regard to a claim for backpay for performing duties of a higher grade than those of the position to which the employee was appointed. The classified higher grade position existed for only 114 days during the period the claimant filled the position. The claim was disallowed since backpay may be granted only for those portions of details to classified positions in a higher grade which exceed 120 days without Civil Service Commission approval.