...
Other than the signature mapped, user need to define the bank account details used in the printout.
Bank Account setting:
1, Go to bank account card, check the box "Default" for the bank that will be used in the SO confirmation / Group Shipment Invoice
...
2, For the payment term used in Sales Order, the box "LC" must be unchecked in the payment terms setup page.
Sales / Purchase Order Confirmation
1, After mapping the e-signature & finishing setup of bank account, go to the Sales Order Page, click "Print/Send" and then "Print Confirmation" in the header
...