have they locked certain materials with material trader since last patch ?

So i got some mats at jamerson's crashsite, and went to encoded material trader, it will only let me trade for certain things, and i notice a lock icon in the background of most of the other materials.
i can understand them maybe not letting you trade for some item you have never found before, but it wont let me trade to stuff i already have, even though i have enough to trade it.
 
This has always been the case I'm afraid. I don't know the logic by which it was decided which can be traded and which can't, but I expect there was one. Maybe.
 
It's how the trade mechanic works. High-grade materials give big amounts of low-grade mats, and you need a LOT of low-grade mats to exchange for high-grade ones. You cannot trade for partial amount - you either get full amount, or can't trade.

Example: 1 MEF can be exchanged into 9 CIFs. Suppose you have 192 CIFs (out of 200). In this case, you cannot use MEF to get CIFs - you have to use other data.
 
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