Article 29 Error of ProcedureI1

the error does not invalidate any step taken in the proceedings unless the member appointed by the Board for this purpose, being either a panel chair or duty member, directs otherwise, either on the application of a party or in the course of conducting the proceedings, and

the panel chair or duty member may make a direction or take any other step that it considers appropriate F1, but such directions or steps must not include the reconsideration of provisional decisions or the setting aside of final decisions, procedures for which are governed by rules 28 and 28A.