In this tab, all those orders appear which are edited in Awaiting Assigning by Ecommerce Brand Manager(EBM)
For example in this screen shot , SKU Quantity is edited to 3 from 5.
After confirming, EBM will select Update
The order will move back to Awaiting assigning and from there you can assign order
Order an also be cancelled , and for cancelling the order one should type CANCEL to confirm cancellation.