Changing Source Codes--Everywhere

Hi all,

A colleague of mine has the wrong source code in an order. I know he can change it after the fact from within the Orders screen, but I also know that won't update T_TRANSACTION. Is there an official way to update the source in ALL relevant spots from the back end? Is it recommended to do so when changing an order source? This one in particular should never have been attributed to the original source, so I would think changing it in T_ORDER but not T_TRANSACTION would throw off our reporting.