How do you support Order Confirmation/Rejection?

SUGGESTED

We're running Update 9 Patch 10.

We have an EDI project that calls for a (Sales) Order Confirmation;

Scenario;

- Customer sends Purchase Order

- We create Sales Order and reference PO.

- We need to be able to confirm or reject the PO from the customer based on Product, Qty, Ship Date, Price defined on PO.

How do you support Order Confirmation/Rejection in X3?