OK, well if we take
UK CAP 694 "The UK Flight Planning Guide" as an exemplar, it says under item 10:
Capabilities comprise the following elements:
a) presence of relevant serviceable equipment on board the aircraft;
b) equipment and capabilities commensurate with flight crew qualifications;
and
c) where applicable, authorisation from the appropriate authority.
In other words the equipment must meet
all those criteria for it to be listed in item 10.
Legally there's no such thing as an official authorization to use certain equipment. There is no separate VOR, ILS or PRNAV endorsement/exam or anything like it.
That's not true in its broadest sense. There
is an operational approval requirement (an authorisation) for the use of PRNAV on routes where PRNAV is required. You shouldn't show PBN/D2 unless you are authorised to perform PRNAV (RNAV 1). Similarly, some states require authorisation, in particular crew training, for RNP APCH (PBN/S1 and S2).
Hopefully, the silliness disappears in August 2016 when Parts-NCO/NCC are applied, amended by
EASA Opinion 03/2015.