When an element is locked, its properties are no longer shown. In other words to note down the physical location or any other existing property, users must first unlock the element, deselect the element, reselect it so the properties show, then relock the element.
It would be more useful to display the locked properties, requiring the above procedure if the user really does intend to change them.
A minor enhancement, but as I increasingly lock down elements a routine I’m frequently having to go through just to have a peek at what’s there.