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How can I modify an invoice to add new items ?
Should a client want other items to be added after an order has been registered, it is indeed possible to add some more, thanks to the 
button as available for each invoice after an invoice search ; the Modify Invoice Page it leads to provides a 'Article list' menu with every possible article no matter which type or category it belongs to :
Next: How do I cancel Up: A :Invoice and Payments Previous: On invoice basic management