How do you edit a deposit amount on a split?

MLScout

In Transactions, I created a deposit and made splits for the amounts to pay some invoices. Then I realized I made a mistake in the total amount of the deposit, but I can find no way to edit the deposit amount in Wave once I set it. The only thing I've figured out to do is delete and re-create the deposit, which is time consuming. Isn't there a way to edit the amount of the deposit on a split? It looks like you can do it for a non-split item, but not for a split transaction.