If you open your gameplay options (in the MP lobby), you'll note that there is an option called "editable savegame" - if this is set to NO, the savegame can't* be edited, and can't be loaded in SP.
(*well, anything can be edited if you're sufficiently determined..)
The intent with that is to reduce the temptation of cheating.
(*well, anything can be edited if you're sufficiently determined..)
The intent with that is to reduce the temptation of cheating.