The setups of this field is a calculation option; it is used to specify if the depreciation is calculated by fiscal year or by period. By default, the depreciation is calculated by fiscal year. When the depreciation is calculated by fiscal year, the depreciation expense calculated for the fiscal year is distributed on the periods and the last period gets the balance sheet amount. When the depreciation is calculated by period, the depreciation expense of the fiscal year is equal to the sum of the depreciation expenses of the periods. This option is only displayed for the following standard depreciation methods: "LP - Linear pure", "UPE - Operation unit", "RD - Residual day", "RM - Residual month", "RW - Residual week". It can only be entered under following conditions: - the plan belongs to the 'Accounting and fiscal" or "IAS/IFRS" context - the method applies to the plan.