Field help (MDRDAT) 

Field reserved for the Polish legislation and submitted to the KPL activity code.

When the depreciation method is the Polish linear (ML).

This field displays the effective date of the improvement application. This date is automatically determined according to the entered improvement date, in the following way:

When the depreciation method is Polish declining (ML).

This field contains the effective date of the improvement application. It can be entered and may be positioned either on the 1st day of the current period, on the 1st day of the next period, or on the 1st day of the first period of the next fiscal year.
The possibility of choosing one or the other of these dates depends on a number of conditions. The latter can vary according to the given plan of depreciation (accounting or tax plan), on the value of the parameter MDRCURPER - Current period improvement (chapter AAS, group CLC), and on the fiscal year during which the improvement occurs.
SEEREFERTTO The rules related to the choice of the implementation date are detailed in the Detailed methods of depreciation linked to the Polish legislation.