Discounted Invoice: Discount Total 0.00

Hello,

I have created an invoice and applied a 10% discount. This appears fine when editing the invoice, but when the client views the invoice the discount is applied as a new line (fine), but the 'Discount' field at the bottom of the invoice says '0.00'.

Is this right? Seems strange to include a field for the discount total at the bottom but not use it.

Thanks in advance