So! I've been trying to get a Monk's Belt enchanted. I was lucky enough to find two of them, so I experimented a little, with the help of a few enchanters.
So the base item has Discipline +2, Weapon Spec Unarmed as a bonus feat, and can only be used by Lawful Monks. All well and good so far.
The base price was low, so I wanted to try and get two attributes on it, then add a rune. I didn't want to be too greedy, since it's a limited item.
I got Dexterity added, and it turned out it couldn't be enchanted further without a rune. A lens test, from two different ones, confirmed that it needed a Greater Rune. Well all right, fair enough.
I happened to get another Monk's Belt, and this time I thought I'd experiment a little, and push it. I got Fortitude +1 on it, then Dex, and had the same result. Still needed a Greater Rune, still double checked to make sure.
So now I go and get a Greater Rune to put on it and...
The rune does nothing. It consumes the rune. It applies the text of the rune. But when anyone attempts to enchant it? 0% chance, in red. It's as if the rune isn't there.
So I've just dropped a pricey rune that doesn't do its function. It feels like it's just bugged, but never come up because it's a loot table item.
If I manage to get attachments to work, I'll attach pictures of both versions of the belt.