Eto lang ha Idea ko Lang (not yet tested), baka makatulong...
Lahat ng Tradable, Untradable and un/Dropable Items pinag isa isang Declaration( Case ). Therefore I Conclude (with 3 dots) Kung malipat mo ang Untradable Data Cases sa Tradable Case - I think that might work.
eto observation while experimenting the tradable and Untradable Thing, mapasin mo na lahat ng kasabay nyang Items are Same Case[Tradable or untradable]
ex. Warrior's Witness [which is untradable] if you try to look lower part sa Browse region puro UNTRADABLE Items.
My point is [Maybe] if you hit the The Header of trade/unTrade it might work.
although hypothesis lang... hehehe... sana naka tulong.
Let's work work work... hehehhe...