(2) Present an analysis demonstrating that all costs assigned to prior periods have been accounted for in accordance with paragraphs (o)(2)(iii)(D), (E), and (F) of this section to ensure that no duplicate recovery of costs exists. Any duplicate recovery of costs due to the change from one method to another is unallowable. The analysis and new accrual accounting method may be a subject appropriate for an advance agreement in accordance with 31.109.