41 C.F.R. § 301-52.9 What will my agency do when it disallows an expense?
Title 41 - Public Contracts and Property Management
Your agency will disallow your claim for that expense, issue you a notice of disallowance, and pay your claim for those items which are not disallowed.
Title 41: Public Contracts and Property Management
PART 301–52—CLAIMING REIMBURSEMENT
§ 301-52.9 What will my agency do when it disallows an expense?