There is no built-in version control management in DI Studio.
What you can see in the metadata is when the object was changed, and by whom. And if you are lucky, a comment on what was done.
What you can do is to either export your job when changed, or use the newly generated SAS program. You could either use an external source code management software, or manually name your programs/exported packages using date-stamps etc.
/Linus
Data never sleeps