D.C. Mun. Regs. tit. 8, r. 8-B1803
If the President, or the President's designee, finds that preparations for a reduction in force are contrary to the provisions of this chapter or would result in violation of employee rights under the law or a collective bargaining agreement, he or she shall require appropriate corrective action . Corrective action shall be implemented prior to the completion of the reduction in force.
An action which has been determined by the President, or the President's designee, to be erroneous as a result of procedural error shall be reconstructed and a redetermination made of the appropriate action under the provisions of this chapter.
The retroactive reinstatement of a person who was separated by reduction in force under this chapter may only be made on the basis of a finding of a harmful error as determined by the President, or the President's designee. For purposes of this section, the term "harmful error" shall mean an error of such magnitude that in its absence the employee would not have been released from his or her competitive level .
D.C. Mun. Regs. tit. 8, r. 8-B1803