Field help (FASDPM) 

This field displays the depreciation method of the asset for the plan.
Only an active mode which the company, the company country and the plan are allowed to use, can be entered.
In the case when association of sections are set up for the financial asset, the method can be automatically determined from the Code (Accounting) and/or from the Group.
The choice of the mode is subject to the following restrictions:

The selection of the depreciation method, either entered or filled by associations, allows you to to load the Depreciation start date, either with the First use date, or the Purchase date, or the Accounting date, depending on the Depreciation method setup.