Field help (STRDPRDATD) 

Help shared by the unit and mass processings of accounting allocation change.
This field can only be entered if the Upd indicator is set to Yes.
It is used to enter the depreciation start date for the asset, or in the case of a mass process for the group of selected assets. It is mandatory that this date is greater than or equal to that of the start of the current fiscal year for the context.
In the case when the change of account posting urges the asset first use, this date is automatically revised using the depreciation start date set up for the depreciation method used.
In mass processing mode, this date is automatically loaded with the "Date put into service" entered in tab "Parameters".
Once a closing has been carried out, this date can no longer be modified.