If I am not mistaken, PJ only shows codes relevant to the current ROM. So the european version has other codes than the USA one.
Anyway, first off, save like you would in the game, then load it. If that doesn't work, remember that cheats aren't always perfect; they can mess up how the game works, hence you would get an error.
Try disabling any cheats prior to the scene and hope it works. You can enable them again after.