how to enter the currency and negotiated amount information in the supplier's portal?

Content:

When agreements and negotiations are in a different currency than the purchase order, it is necessary that the supplier can always visualize the currency in which it was negotiated in order to have traceability and not have confusion, especially at the time of invoicing.

Considering the enhancement "Process Requisitions into Purchase Orders in the Invoice Currency of the Supplier Site" that brings 23C, it becomes necessary to display on the supplier's portal the currency and amount information that gives rise to that transaction, similar to how it is displayed on the purchase requisition screen.

The question is: how to enter and maintain the currency and negotiated amount information in the supplier's portal; at line and header level?