S. 148A: Reassessment-Conducting inquiry, providing opportunity before issue of notice-Unexplained investments-Violation of principle of natural justice-Order passed without considering the documents submitted by the assessee-Assessment order is set aside and matter is remanded for reconsideration from stage of reply to show cause notice cum draft assessment order.[S. 69, 148, 148A(b), 148A(d), Art. 226]