TPG2017 Chapter II paragraph 2.41

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Where the accounting practices differ from the controlled transaction to the uncontrolled transaction, appropriate adjustments should be made to the data used in calculating the resale price margin in order to ensure that the same types of costs are used in each case to arrive at the gross margin. For example, costs of R&D may be reflected in operating expenses or in costs of sales. The respective gross margins would not be comparable without appropriate adjustments.

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