In these circumstances, the tax administration can consider ex post outcomes as presumptive evidence about the appropriateness of the ex ante pricing arrangements. However, the consideration of ex post evidence should be based on a determination that such evidence is necessary to be taken into account to assess the reliability of the information on which ex ante pricing has been based. Where the tax administration is able to confirm the reliability of the information on which ex ante pricing has been based, notwithstanding the approach described in this section, then adjustments based on ex post profit levels should not be made. In evaluating the ex ante pricing arrangements, the tax administration is entitled to use the ex post evidence about financial outcomes to inform the determination of the arm’s length pricing arrangements, including any contingent pricing arrangements, that would have been made between independent enterprises at the time of the transaction, considering the guidance in paragraph 6.185. Depending on the facts and circumstances of the case and considering the guidance in Section B.5 of Chapter III, a multi-year analysis of the information for the application of this approach may be appropriate ...