Aren't some healing spells part of the necromancy school? So wouldn't, under the logic presented here, mean that priests would also have to be charged with necromancy?
Also, looking over the description of necromancy spells via the NWN wikia, the impression and descriptions deal with life force, not souls, per say. An argument could be made, in this setting, that souls and life-forces aren't inexorably linked. It may be possible to have one without the other i.e. undead or constructs.
So my question, under this reasoning, would be if souls are considered exclusively part of the life-force in the Ravenloft setting? If so, then I could see an argument for enchanting and necromancy perhaps being linked. But if the answer is that they may be separated, then perhaps, soul affecting magic may actually be considered part of another school altogether?
Mind you, I'm not really that versed in the magic-inspired mechanics of the game, so if I'm off the rails, forgive my opinion.
PS: If someone is going to charge someone with necromancy for enchanting, I reaaaallllyyyy want in for the defense on this one. LOL. I call dibs. LOL.