MEDEX
I agree it's you, if the approach is in the database then there should no problem but that is not what was questioned.
Some people want to use GPS distance instead of DME distance for approaches, in the USA this is not a problem because you can't have a radio aid with the same ident within 50 miles, in Europe you can.
So ( to take Larnica as an example) there is a VOR/DME at the eastern end of the field and an NDB four miles off the western end of the field both with the same ident, in the old days no chance of confusion because three ident and only one per piece of radio kit.
Now if you punch into your GPS the ident you have the chance if you are not very careful the distance from the wrong point. Let's say you are doing the VOR/DME to the easterly runway but you have no DME so you put LCA into the box and mistakenly select the NDB instead of the DME, everything is plausible until you arrive at minima and you are eight miles from the airfield or you go around and no amount of left turn picks up the outbound raidial for the missed approach because you have yet to reach the VOR.
I am not aganst replacing DME with GPS distance but it should not be done in Europe until the multiple ident issue has been resolved.