You can change the material master using one of three different methods. The easiest method is to change the required fields in the material master and activate these changes immediately. Changes can also be planned in advance. You do this either by entering a planned change for a single material master (with the date on which the changes are activated) or using the Engineering Change Management function. In this case, changes to several objects (materials, BOMs, task lists, and so on) can be grouped together in a change master record and activated on a defined date.