In the first part of the Scenario game there's a quest where I need a few items that I get from killing NPCs - the one where you need to get ogre blood, wolf flesh and some other stuff.

Thing is, I rushed the scenario because I rebooted my game and I sold all of the flesh to the vendor, now I can't finish the quest.

It would be great if quest items would be marked as not sellable (at least one of them, since you get a lot of ogre blood and wolf flesh throughout the game).

It's somewhat frustrating to later figure that I can't finish a quest because I killed all NPCs that would drop the required item and sold them.