The API documentation for half.com fields here - http://developer.ebay.com/devzone/guides/ebayfeatures/Development/Sites-HalfFields.html#userNotes

Notes Item.PrivateNotes for seller notes is supported. And it certainly used to be. But now setting this field causes an error 219451 "Field no longer supported" for both AddItem and ReviseItem. All other fields work as documented.

Is this a documentation defect or a code defect?