When inventories are sold, the carrying amount of those inventories should be
recognised as an expense in the period in which the related revenue is recognised. The
amount of any write-down of inventories to net realisable value and all losses of
inventories should be recognised as an expense in the period the write-down or loss
occurs. The amount of any reversal of any write-down of inventories, arising from an
increase in net realisable value, should be recognised as a reduction in the amount of
inventories recognised as an expense in the period in which the reversal occurs.