If it does not allow you to continue with the update of the financial data, it is necessary that you first check that all your personal data are completed, as if any of them are not completed and/or incomplete it will not allow you to update any banking data.
Remember that to be able to change your financial details, you have to erase all the three sections (Name, ID and account's number) and write all again, even if you only change the account's number. If you dont write all again, the system won't be able to change it.