Using Zen Cart 1.3.8a.

On the Customers Menu>Orders, I select an order and click the Invoice button to the right. The invoice is displayed, however, the amounts are all the same; ie excluding VAT. The Sub-Total, Carriage and Total amounts are correct but the line items are not. For example, they show:-

Tax Price (ex) Price (inc) Total (ex) Total (inc)
15% £17.39 £17.39 £17.39 £17.39

When it should should £17.39, £20.00, £17.39 and £20.00 respectively. I think the answer is in Invoice.php and Orders.php but not sure where.

If anyone can shed some light on this matter, I would be eternally grateful.

Many thanks.
Dave