This field is entered only if, following the account posting change, the plan has been subject to a method change that must be taken into account (active "Process" index on the "Setups" tab). It is loaded either with the code of the rule entered in setup, either with the initial code if the asset is in error or if no code modification has been asked on the "Setup" tab. It can still be modified. Recall related to the depreciation plans managed according to the IAS/IFRS standards or according to the CRC 2002-10 standards: the modification of the rule specific to an asset having been subject to a financial year or period closure and of which the current depreciation method is "PL" (Pure linear), must necessarily come along with the modification of the depreciation method. (This one can only take "RJ", "RM", "RS", "UO" or "SA" as values).