Inventories are measured at acquisition cost or manufacturing
cost or at lower net realizable value. Manufacturing
costs include not only the direct material and manufacturing
expenses, but also the attributable material and
production overhead costs as well as production-related
administrative expenses and depreciation. The average
cost method is applied to calculate the acquisition or
manufacturing costs of inventories of the same type.
Usage risks resulting from storage time are taken into
account
by way of value reductions on the basis of
historical usage. Once the reason for the write-downs
ceases to exist, a reversal of the write-down is carried
out.