This feature is linked to the Basic data form (Settings tab, Allow negative WIP locations check box). To change the setting of this field, use the Allow negative WIP locations process. This process checks whether it is possible to change the setting. For example, if you want to disallow negative WIP locations, you can only do so if no negative WIP location lines are present. You will receive a notification if the field cannot be changed. This notification will then be added to the log.