This shows your tank over/shorts for the day per fuel grade based on the sales of fuel leaving the store and purchases of fuel delivered to the store.
Be sure to check that your over/shorts are within range. Check, and correct, the recon date in the fuel invoice so it reflects when the fuel was actually pumped into the tank(s).
If you are missing an invoice you can enter it as needed. Or create an S2K support ticket and we can investigate for you.