Credit Note not calculating total discount

Dear All,

I have sales order with 5% total discount and terms of payment as cash. After invoicing the sales order, axapta 2009 calculates 5% discount and all totals are correct. Once i create a credit note then total discount is not calculating and totals has no discount values. Any ideas please ? what can be the issue. Even i checked the customer details. It is okay.

Thanks,

Sayeed