It seems Capcom are riding the anti-trading wave with this new feature discovered by someone over at NeoGaf. Anything you do in Resident Evil: The Mercenaries 3D cannot be deleted, meaning that anyone who obtained the game second hand will be forced to play with the previous users data. Not only that, but your actions in the game can never ever be taken back.
Whilst some are saying this was implemented on purpose by Capcom as an anti-trading measure, it is unknown if that really is the case or if it was an error overlooked by them. Either way this could become a major issue, so be sure to share your thoughts below.