Dr R
The same thing applies in PNG. Don't know whether other countries have followed suit though.
QSK?
which implies that it may be adopted by other countries unless they lodge a formal difference.
Not true. Differences only need to be filed against Annex requirements, not against specifications in a "Document". It's a subtle but important difference because Contracting States are only required to specify how they implement any particular document. This means, unfortunately, that you need to read the AIP for the particular country (i.e. Fiji, if taking the oiginal example), to find out whether or not they have implemented the Document in-toto or not.
The biggest problem with this is that one must know the contents of the relevant Document before studying the way in which a Contracting State has implemented it. In most cases, a State's implementation will only describe instances where a higher standard than that stated in the ICAO Document is used. The use of a lower standard is not regarded as an implementation of the ICAO specifications in the Document and I'm not aware of any Contracting State doing so.