Transactions should not be importable to deleted/closed accounts

[AAraKKe]

Description

I just noticed that if you close an account that is associated with an entity, you can still create transactions in that account but they are not visible anywhere. Somehow the API does not error out for closed accounts. We need to make sure that before importing a transaction we validate whether the account is closed or not and, if it is, prompt the user to select an account to import transactions to.