The type of the new invoice (charge or credit note) is defined by the invoice type toolbar buttons:
If both invoice types are selected, the creation of a new invoice is not allowed.
Until a new invoice can be created, the type of the invoice (customer or order) has to be defined by selecting it from the corresponding tree structure. Mixed invoicing is not allowed, which means that the invoice can’t include order lines from different orders.
Selection of order type invoice
The order is selected from Orders Selection tool bar.
Click Add Invoice 
to add a new invoice to the Invoices list. Click Window > Invoices to display the Invoices list. When a new invoice has been created, it is automatically
set to draft mode.
There are no invoice lines before the order lines have been added to invoice.
Display Invoice lines using Windows > Invoice lines.
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Select order lines.
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Click
to add selected rows. Click 
to add all rows.
