2 keys

[Statyk]

Took a bit to realize, but once I re-read your key isn't working on the door, something is up with the AddUseItemCallback:

//___________________
void OnStart()

{
AddUseItemCallback("", "doorway", "mansion_4", "FUNCTION", true);
AddUseItemCallback("", "floortwokey", "mansion_9", "UsedKeyOnDoor", true);
}

void FUNCTION(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked("mansion_4", false, true);
PlaySoundAtEntity("", "unlock_door", "mansion_4", 0, false);
RemoveItem("doorkey");
}

//_________________________

Turns out you have the wrong name of the key in the AddUseItemCallback. I believe it should be "doorkey", NOT "doorway".