In other words, investment must be financed by some combination of private domestic savings, government savings (surplus), and foreign savings (foreign capital inflows).
Instead, the appropriate policy response often lies elsewhere -- for example, through measures to improve domestic saving, boost competiveness, and raise the growth rate of potential output.
Less obvious methods to reduce a current account deficit include measures that increase domestic savings (or reduced domestic borrowing), including a reduction in borrowing by the national government.