Bank Account Details when Order changed in Backend

Hi,
Version: OC 2.3.0.2

When a customer places an order and selects bank transfer as payment option, then the bank account info is being provided in the order confirmation email. If I change now the order details in the backend finally press the "Save" button a new order confirmation email is being sent with all the details, except the Bank Account Details in the comment field as in the inital order email confirmation.

Any idea/hint which file(s) I need to change with what so I get the bank details

Thanks for your help.
Chris

You will have to manually paste the new bank information into the order history comments, then click "notify" before you send it out. There's no automated way for that unfortunately.