The Assignment Fields to Ignore tab will instruct the Change Recorder what Assignment Fields shall not be recorded.
Fields to Ignore List
This list will contain all of the assignment fields chosen to ignore changes to. An item can be deleted from the list by clicking on it and pressing the DELETE key on the keyboard.
An item can also be changed to a different field by clicking on it and then opening the menu that appears:
Assignment-level data stored in custom fields (such as Text10) is maintained separately for the Task Usage and Resource Usage views in Microsoft Project. Although both views display assignment data, Microsoft Project treats the assignments in each view as distinct entities. As a result, the Change Tracking Tools provide separate options for Resource Usage and Task Usage assignment fields.