S. 147: Reassessment-Lease rent-Unrealised gain-Depreciation-Absence of fresh tangible material-Reopening cannot be initiated on repetitive lease rent transactions accepted in past scrutiny assessments, unearned/unrealized foreign exchange hedging variations, or by applying prospective amendments on goodwill depreciation retroactively-SLP of revenue dismissed. [S. 32(1), 37(1),43(6) (c), 148, Art. 136]