Node properties should reflect currently effective data
Current design for node location property is to show the last known value. For example a device is added and has a location this location is shown. If the location field is made empty the property in SCOM is not updated. This behavior is a deviation from the normal behavior for object properties as they do reflect the current effecitve data. Please remove this deviation and always show the current effective value, if we want to know a historical value we do have a data warehouse and reporting capabilities.