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1. Press the 'Create New' button
2. The New Sales Invoice / New Purchase Invoice screen is displayed
3. Using the top part of the screen, leave Invoice type with its default of 'Sales Invoice'
4. Leave 'Organization Party Id' with its default of 'Company' 
5. Enter or use the lookup to find the 'To Party Id'  (eg DemoCustomer)
6. Press the 'Create' button in the top part of the screen
7. The invoice header has been created and the default header screen will be displayed
8. Details on the invoice will need to be entered via the other sub menus (eg Items, Time Entries etc) 
   
   

How do I update an invoice?

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