S. 148A : Reassessment-Conducting inquiry, providing opportunity before issue of notice-Rejection of rectification application-Violation of principle of natural justice-Notice and assessment order was quashed-Cost was imposed on the Revenue-The respondents were directed to pay cost of Rs. 50,000 to the assessee. [S. 147, 148, 148A(b), 148A(d), 154, Art. 226]