Remove default accounts from journals
Currently the statement move lines are created using the accounting journal default credit/debit account. This forces the user to create an accounting journal for each account which adds unneeded complexity.
In a database with multiple companies, this is more complex to manage as the accounting journals are shared between all the companies but the statement journals are company specific. So you end up with a lot of accounting journals created only for statement usages that are not needed on all companies.