It seems that you can add the same item twice, like adding carapace armour even though you have it already.
Maybe an asterix could be put next to the items you have in the list already to make the user aware that you're adding something the character already has, and still opening it up for adding two of the same items.
from dakka:
https://www.dakkadakka.com/dakkaforum/posts/list/724493.page;jsessionid=C8408BB4EA6E336B41E1B52B4E1554A0
It seems that you can add the same item twice, like adding carapace armour even though you have it already.
Maybe an asterix could be put next to the items you have in the list already to make the user aware that you're adding something the character already has, and still opening it up for adding two of the same items.