S. 245D : Settlement Commission-Settlement of cases-Procedure – Application-Single judge allowing writ petition filed by Commissioner of Wealth-tax and Commissioner of Income-tax against order under section 245D(4) passed by Settlement Commission No allegation that decision of Settlement Commission not in accordance with provisions of Act or based on bias, fraud and malice-Order of single judge in writ petition set aside-Blackstonian theory- Precedent Retrospective application of later judicial decision theory-Decision rendered later would have retrospective effect clarifying legal position which was earlier not correctly understood.[S. 245B(3), 245D(4) Art. 226]