Limitation on duplicate deductions: claiming specified business exemptions bars other deductions and mandates market value transfers. Amendments prevent duplicate deductions by providing that where profits and gains of an undertaking are claimed as a deduction under specified business-exemption provisions, no deduction in respect of those same profits and gains shall be allowed under any other provision for that assessment year and the deduction cannot exceed such profits and gains. A separate rule bars allowance where the deduction under those provisions is not claimed in the return. Transfers of goods or services between the exempt business and other businesses must be valued at market value for computing deductions.