BallScore automatically checks each scoresheet after every event to make sure they are balanced. You can apply a sticky note to the right side of the scoresheet that will always show the current balance state of both scoresheets. If you are not using sticky notes then press Ctrl+B at anytime to see the current balance state of the current scoresheet. 95% of all out of balance scoresheets result from an improper amount of men left on base. Be especially careful when an inning ends on a fielders choice with the bases loaded. You must have 3 men LOB in this situation. If your scoresheet goes out of balance in this situation then edit the cell for the last batter and check the box for 3 LOB's.
BallScore uses the Major League Baseball method of balancing a scoresheet. Depending on your leagues rules it may be impossible to balance a scoresheet properly using the MLB rules.