Guidelines for Editing Sales Orders and Stand-alone Return Authorizations
You can edit a sales order after it is invoiced and a stand-alone return authorization after a credit memo or a cash refund is generated. You can only make these changes:
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Increase the item quantity on the line item
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Add a line item
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Select a different rebate for the new line item
You cannot remove a line item or decrease the item quantity on the sales order or stand-alone return authorization.
When you increase the item quantity on the sales order and generate another invoice, the new invoice reflects the rebates for the additional items only. Rebates on the previous invoice are not recalculated when you edit the sales order associated with it.
Rebates on additional items for a stand-alone return authorization are only applied to the next credit memo or cash refund.