In the event of an impairment loss on an asset for use, the loss is recognized as an expense in the period of loss; if the decline in value is due to a previously revalued asset, the reduction in value is adjusted to reflect the reassessment value, and any remaining balance of loss is charged to expense.
When the impairment loss amount equals the amount recorded in the income statement for the previous period, the remaining revaluation balance is parked in the revaluation reserve for the same class of asset.
As a result, in the given situation, Wyeth Company has to park the increased amount of assets due to revaluation in the income statement and the balance in the revaluation reserve of the asset class.