Sales orders can only be edited if no items have been received from the sales order. If any items have been received, the corresponding sales/receipt must be removed before the sales order can be edited. In this case, the sales order should be closed. See Closing a Sales Order. Closing a sales order will remove all remaining 'quantity on order' quantities from inventory.
When a sales order is saves, the journal entry is re-posted to the database and the quantity on order values are readjusted. This action will not affect the income statement or balance sheet since a sales order represents an allocation of inventory and not an actual sales (monetary transaction).
Entering a new customer
Editing a customer contact
Deleting a customer contact
Setting customer payment
Payment terms and credit limits
Entering a sales order
Deleting a sales order
Closing a sales order