It can only be modified if the account posting change creates a transfer from an account In process to an account In service.
Changing this date automatically updates the depreciation start date for the depreciated plans according to a method for which the depreciation start date is loaded with the start-up date.
In mass processing mode, the "Date put into service" can be entered if an entry into service is detected (transfer from a "Fixed asset in progress" account to a "Fixed asset in service" account). It automatically loads, in tab "Depreciation plans", the "Depreciation start" date for each of the depreciation plans selected to be processed.