S. 45 : Capital gains –Investment in foreign exchange – Deduction of tax at source- Principally- Taxation of business profits was expressly dealt with by article, those business profits could not be taxed in source jurisdiction for want of satisfying fundamental condition precedent for its taxability, i.e., existence of a PE in source jurisdiction – DTAA-India -Spain [ S.56 , Art . 7, 14(1) (14(5) ,23 (3) ]