If a field on a layout, has an object name "myObject", but that field is in fact a related field, the Go to object "myObject" my object will fail with an error 101 "record is missing".
Therefore we can't go to the object !
That's very unfortunate as we then can't get any data of that object, and especially we can't sort by it with sort record by field.
The object is on the layout, so we need to be able to access it. If it's content is existing or not is another question (that we can get info of, if we can get to it).
So this excellent sorting technique Smart Sort List View doesn't work if there's missing related records
Mac Filemaker 16 on macOS 10.3.4