S. 44C: Non-residents-Head office expenditure-Double taxation relief-Article 7(3) of the DTAA between India and UAE-Asessee claimed deduction u/s. 44C-AO allowed only 5% of the adjusted total income as deduction-Held, Art. 7(3) cannot be applied retrospectively-Held, deduction allowed without imposing restriction u/s. 44C-Expenditure incurred outside India exclusively for operations of Indian branches would not fall within ambit of section 44C hence allowable in full-DTAA-India-Dubai [S. 90,Art.7(3), 25(1)]