Fereldan Locks Glitch

I've had tons of Fereldan Locks requisitions (I did a little grinding in my last playthough, and they're easy to do from the lake camp in the Hinterlands), and as far as I know, they aren't bugged. You only have to be careful not to leave that requisition hanging around long enough as for the enemies giving that material not appearing anymore. The same can be said about lots of other requisitions (the dwarven objects' one in the Wastes comes to mind).

That doesn't mean the game couldn't benefit from the Val Royeaux Codex merchant also selling the items for those non-achiveable requisitions...