Approval procedure for requisitioning valuation services and making references under income tax rules. Procedure is prescribed for approval of persons or entities whose services may be requisitioned under section 247(5)(b), and for approval of the Valuation Officer, a person registered under section 514, or any other person or entity or registered valuer to whom a reference may be made under section 247(9). The application for approval is to be made in Form No. 85 and disposed of within six months from the end of the month of application. A Designated Approval Number may be issued on approval, and in urgent cases an unapproved person may be requisitioned or referred to after recording reasons and obtaining approval within thirty days.