Rectification of record errors permits authorities to correct apparent clerical mistakes, subject to procedural limits and natural justice. Any authority that issued a decision, order, notice, certificate or other document may rectify errors apparent on the face of record on its own motion or when brought to its notice by an officer or the affected person, within a prescribed procedural window subject to an outer temporal limit; clerical or arithmetical slips are treated with relaxed time constraints, and adverse rectifications require observance of natural justice.