OE invoice amount is different in form that on screen

Hi,

We have allowance discount in an order. We used a negative quantity with a positive amount to reflect it.

After the order was shipped, we were informed that the amount of the discount had changed. We changed it in the invoice entry screen, and the total at the bottom displayed correctly. But when we printed and posted the invoice, the invoice total displays the original amount. And this amount is what was posted in AR.

Any thoughts?

Thank you.