48 C.F.R. § 204.1601
(c) Change in the PIID after its assignment. When a PIID is changed after contract award, the new PIID is known as a continued contract.
(i) A continued contract—
(ii) When issuing a continued contract, the contracting officer shall—
(A) Issue an administrative modification to the predecessor contract to clearly state that—
(1) Any future awards provided for under the terms of the predecessor contract (e.g., issuance of orders or exercise of options) will be accomplished under the continued contract; and
(2) Supplies and services already acquired under the predecessor contract shall remain solely under that contract for purposes of Government inspection, acceptance, payment, and closeout; and