gains from infrastructure undertakings - Assessment year 2003-04 - Assessee claimed deduction under section 80-IA from its captive power plant unit - Assessing Officer allowed assessee's claim - On appeal, Commissioner (Appeals) reduced amount of deduction for following reasons: firstly, assessee had taken into account electricity tax levied by State Government while 527-Asr-2024 Satia Industries, Muktsar 40 working