When you train schematic at UCH you have to have skill points to train it... in addition to the schematic itself.

Chances are you do not have it trained already. You can check if you do by going to any Advance Constructor you own and filter for All, Devices and then Search: "Sent" or "Sentinel" .. if you have it trained it'll show up even if you don't have the materials to build one.

The schematic computer is in the lab, which is hanging in the ceiling of the hangar (take any of the elevators to get to the floor it's on).

引用自 ravien_ff：

The schematic computer is in the lab, which is hanging in the ceiling of the hangar (take any of the elevators to get to the floor it's on).

Thanks ravien - however, I am using the schematic computer. I decrypted the schematic and have the item Sentinel Flak Turret Schematic - however, I can't trade it in at the same computer. I'll take a look at the above suggestion from Xarq though.

引用自 Xarq：

When you train schematic at UCH you have to have skill points to train it... in addition to the schematic itself.

Chances are you do not have it trained already. You can check if you do by going to any Advance Constructor you own and filter for All, Devices and then Search: "Sent" or "Sentinel" .. if you have it trained it'll show up even if you don't have the materials to build one.

Thanks Xarq, it seems I haven't unlocked it yet - so will wait till I have 50SP available and trade it in then. Now it makes sense :)

No worries man. I had the same issue with another schematic. I'm still pretty new to this game... been playing RE almost 5 months now. Having a blast!