48 C.F.R. § 252.204-7006
252.204-7006 Billing Instructions—Cost Vouchers.
As prescribed in 204.7109(b), use the following clause:
When submitting a request for payment using a cost voucher, the Contractor shall—
(a) Identify the contract line item(s) on the payment request that reasonably reflect contract work performance; and
(b) Separately identify a payment amount for each contract line item included in the payment request.