A summoned item of any type cannot take up the same space as the Enchanted item previously did or the character risks the binding magicks becoming unstable as the item phases in and out of oblivion.
Likewise, should one enchanted item that is generating a Bound item be replaced by another bound item, it will provoke the same effect as the item fails spectacularly in a cascade-failure of enchantments.
Mechanically, this means that should a summoned item coexist on the same location as the enchanted item (an enchanted chestpiece conjuring a bound one, or a character with boots conjuring a bound chest plate on top of the chest plate generating a bound helmet), the character must roll a 1d100 at the beginning of every Turn, on a result of 20 or lower, the character takes a wound to that location instantly.