Is Amulet of Natural Armor a valid target for Magic Vestment?

[dunelord3001]

Title says it all. My gut says no, but Hero Lab says yes and it is very seldom wrong.

[Charlie Bell]

Magic vestment wrote:

You imbue a suit of armor or a shield with an enhancement bonus of +1 per four caster levels (maximum +5 at 20th level).

Probably a bug.

[concerro]

No it's not a valid target.

[Robert A Matthews]

Hero lab is wrong all the time. Never base correctness of rules on hero lab. There are a couple of problems here. First, you must cast magic vestment on armor or a shield of which amulet of natural armor is neither. Also, enhancement bonuses don't stack. Amulet of natural armor is already providing an enhancement bonus.