If you enchant a sword even to +1, you can no longer dual this sword.
you sure?
i remeber there being a warning somewhere
"the game will randomly choose the sword from your inventory"
it was a warning because someone would want elven*elven swords and have 2 elvens and a +3 elven and would accidently duel them
If your going for +4 and above then its a 33% chance it will blow up. +1 +2 & +3 is a safe bet tho.
So if you wanna put that SA on your duals, you got a 66% chance of success. However i usually just buy the duals already enchanted, its expensive, but safe.