After a Sales Order (SO) has been created, you can still edit it to make alterations. Go to Distribution -> Order Taking -> Edit Sales Order.

1. Key in your SO number, or from the SO Listing, click Edit.
   
   
   
   
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2. You can alter basic details about the SO.
   
   
   
3. You can also Add, Edit or Remove items from the listing.
   
   
   
4. Once approval has been given, a user with sufficient permissions can convert the SO to an invoice.