38 C.F.R. § 21.420
(a) General. VA will inform a veteran in writing of findings affecting receipt of benefits and services under Chapter 31. This includes veterans:
(b) Notification: Each notification should include the following:
(c) Adverse action. An adverse action is one, other than an interim action such as a suspension of benefits pending development, which:
(d) Prior notification of adverse action. VA shall give the veteran a period of at least 30 days to review, prior to its promulgation, an adverse action other than one which arises as a consequence of a change in training time or other such alteration in circumstances. During that period, the veteran shall be given the opportunity to:
(e) Favorable findings. Any finding favorable to the veteran is binding on all subsequent agency of original jurisdiction and Board of Veterans' Appeals adjudicators, unless rebutted by evidence that identifies a clear and unmistakable error in the favorable finding.
(Authority: 38 U.S.C. 3102, 5104, 5104A, and 7105)
[49 FR 40814, Oct. 18, 1984, as amended at 54 FR 40872, Oct. 4, 1989; 84 FR 193, Jan. 18, 2019]