The error “Not yet implemented” comes from GroupWise (the ObjectAPI to be precise) – Formativ simply captures and displays the error.
I am not sure why you are seeing this error. According to the online documentation of FieldDefinition, FieldID is available in “GroupWise 5.5 and later”.
Have you tried to call the following method – before enumerating the library field definitions?
You may find the answer to this error, and the strange ‘ghost’ and ‘old’ names among the support options offered by Novell.
I hope this helps.