Limitation
Paragraph (1) shall not apply if the amount paid is allowable under section 2053 as a deduction in computing the taxable estate of the decedent, but this paragraph shall not apply if (within the time and in the manner and form prescribed by the Secretary) there is filed—
(A) a statement that such amount has not been allowed as a deduction under section 2053, and
(B) a waiver of the right to have such amount allowed at any time as a deduction under section 2053.