Answer:
1. Delete your delivery. Just run VL02 and goto menu: Outbound Delivery - Delete (Shift+F1)
If you have PGI under your delivery - you need to cancel it (use transaction code VL09 for reverse the delivery).
If you have sales invoice under that delivery - you need to cancel billing doc. using VF11.
2. Rejecting the sales order. Rejection via VA02:
You can enter a reason for rejection for one or more items. These items are then not copied into the subsequent documents.
If you reject an item in a sales document, the system automatically cancels any materials planning requirements (MRP) previously generated for the item.
You can either reject the whole sales document or individual items.
Reject all items:
1. If you want to reject all the items, choose Reject document in the change modus for the sales document.
The system automatically selects all the items and you can enter a reason for rejection in the following dialog box.
2. Enter the appropriate reason for rejection and choose Copy.
The system assigns the same reason for rejection to all the selected items.
Reject individual items:
1. If you only want to reject some of the items, select those items in the item overview screen and choose Edit - Fast change of... - Reason for rejection.
A dialog box appears in which you can enter the appropriate reason for rejection.
2. Enter the appropriate reason for rejection and choose Copy.
The system assigns the same reason for rejection to all the selected items.
Reject individual items with different reasons of rejection:
If you want to enter different reasons for rejection for the items, choose the Reason for rejection tab page from the overview screen when changing the sales document. You can enter a different reason for rejection for each item in the Reason for rejection field.
