Section 600.205 - Additions and exceptions(a) For classes of grants and grantees subject to this subpart, Federal agencies may not impose additional administrative requirements except in codified regulations published in the FEDERAL REGISTER.(b) Exceptions for classes of grants or grantees may be authorized only by OMB.(c) Exceptions on a case-by-case basis and for subgrantees may be authorized by the affected Federal agencies.(d) The DOE procedural requirements for requesting additions and exceptions are specified in § 600.4 .53 FR 8087, Mar. 11, 1988, as amended at 53 FR 8047, Mar. 11, 1988