When an order is submitted it will either go into Pending or In Review status, depending on who submitted it.
PENDING: Orders placed by a Brand User. Sales reps can edit as many times as needed and it will stay here in PENDING. When the order is final, look for the action to "approve" the order.
IN REVIEW: Orders that the Buyer placed on their own, for your review. Once a sales rep has reviewed the order, they can "approve" it. Buyers and brand users can edit these orders, and they will stay IN REVIEW until they are approved.