Hi Marlon,
The 'Payment Disc' is only used in OE when a check number and payment amount is assigned to the order/invoice, and the customer Terms has a discount date later than the OE document date.
If you see a dollar amount in the Payment Discount, first determine if a payment was associated with your document. Then look at the Totals tab for the Terms discount date and %. I suspect that perhaps there is a terms discount % unexpectedly on the document.
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Regards,
Softrak Tech Support