Scrolling Locked Item

I think it's just a generic warning for when you use any type of Scroll on a locked item, as a forewarning that if, say, that scroll you're using was a 70% or 30%, that the item still--obviously--has the chance of being destroyed and thus would destroy the locked item.

Usually people lock their items so hackers can't drop them/take them/destroy them. So that's why the warning is there, even if you, the owner, are using a Scroll and even if the Scroll is or isn't a 70% or 30%.