I guess this is all about EASA being wary of this dangerous new technology and heaven forbid pilots flying GPS approaches coupled with ensuring someone in EASA land holds all the cards as to what crews can and cant do. It is in many ways an extension of the N reg debate.
Simply put EASA doesnt want anyone flying GPS approaches unless they can pin the responsibility on an EASA member state for authorising the crew to fly the approach.
Doubtless it is also part of a revenue generating policy now that every airline in due course will probably have to pay a fee to one or another of the national authorities. Inevitably for them it is just another regulatory fee that in the great scheme of things doesnt add up to much and will be passed on to the paying passengers, but equally it is another nail in the coffin to most GA pilots who are struggling to make the flying sums add up at the moment.
It is complete and utter nonesense of course and yet another example of the complete incompetance of EASA.