2 C.F.R. § 930.225 – Purchasing systems standards.

(a) Any awardees that currently perform under other expenditure-based Federal procurement contracts or assistance awards are subject to the same standards for purchasing systems that apply to those other Federal awards.
(b) Any awardees that do not currently perform under expenditure-based Federal procurement contracts or assistance awards should be allowed to use its existing purchasing system as long as the system, at a minimum, is able to flow down the applicable requirements in Federal statutes, Executive orders, or Governmentwide regulations.