2 C.F.R. § 25.210
To implement the policies in §§ 25.200 and 25.205, an agency may add a unique entity identifier field to application forms or formats previously approved by OMB, without having to obtain further approval to add the field.
[75 FR 55673, Sept. 14, 2010, as amended at 79 FR 75879, Dec. 19, 2014]