Good question to ask your CSM. I have never seen anyone use it.
When I help out at another store after my shift is over at my store, I just punch in like normal with an override.
There are some people that are scheduled between two job descriptions. It might be for that. Work as Cashier for 4 hours and then CC for 2 hours. Or, Grocery for 4 hours and then Dairy for 3 hours.
The Floor Sweep has its own punch option.
It might be software designed to fit many companies instead of just Kroger and they just left the option there.
Or, it could be for the robots they plan to replace all the manual labor with in the next 20 years.