. 20 and fasb statement no . 3 . 2019 2019 sfas no . 154 requires companies to recognize ( 1 ) voluntary changes in accounting principle and ( 2 ) changes required by a new accounting pronouncement , when the pronouncement does not include specific transition provisions , retrospectively to prior periods 2019 financial statements , unless it is impracticable to determine either the period-specific effects or the cumulative effect of the change . fin no