User who created the version. This read-only String property is set by the server upon successful addition of the annotation to a value in the PI archive.
The object placeholder is an object expression that evaluates to a PIAnnotation object.
As of PI Server version 3.4, the server is not setting this property; so it is blank. It will be supported in a future release of the Server.
The User ID is actually stored rather than text name. On retrieval the ID is translated to text. Thus user re-names on the server will be reflected in this property. This is a read only property.