Use Discount Amount Indicator on Invoice

Where do I find the "Use Discount Amount" indicator on the Invoice? We are bring Invoices via invoice interface and they have a discount amount and terms etc. We don't want Oracle to recalculate the discount amout based on terms, just want to use the amount given in the Invoice interface (its coming from legacy and we want to pay the invoice in Oracle AP) so we don't want to touch the discount amount.

Example

The Interfaced invoice is carring this data

Invoice Amount = 10,000

Terms = 2% 10 NET 30 (standard terms for this vendor)

Discount Amount 211.50 (this was given by the vendor)

We want to keep the above data and not have Oracle recalulate the discount amount (which it does). I have heard Oracle has a "Use Discount Amount" flag that would allow to Freeze the amount.