S. 9(1)(vi) : Income deemed to accrue or arise in India-Royalty-Fees for technical services-Sale of software-Wrongly offered as income in the return-Return was not revised-Not chargeable to tax-Matter remanded to the file of Assessing Officer to verify the facts-DTAA-India-UK [S.9(1)(vii), 139(5), Art. 13]