@jays Are you talking out the subsidiary base currency? If so then multibook will not work, I am going though a base currency change project myself, it is quite complex, had to create a new subsidiary with the new base currency then move(recreate) all the transactions, employees and other related entities to the sub then by reverse journal entry zero out the sub's balance. Along the way lots of other JE is to fix the currency reval, CTA and elimination transaction. Pretty complex and tedious process (almost completed in the sandbox)