If an instrument executed before September 12, 1981, provides for a power of appointment that may be exercised during any period after December 31, 1981, and such power of appointment is defined in terms of, or by reference to, the maximum amount of property qualifying for the gift tax exclusion under federal law, then such instrument shall be construed as referring to the maximum amount of property eligible for the annual gift tax exclusion as was allowable under the Internal Revenue Code in effect on the date of execution of such instrument provided that the instrument described has not been amended after September 12, 1981, to refer specifically to the federal gift tax exclusion available after December 31, 1981, or the amount qualifying for such exclusion.
Va. Code § 64.2-431