To edit a draft invoice, search for the invoice or select it from the related property and click the 'edit' link.
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Once correctly edited, untick the 'save invoice as a draft' option and click the 'save' button. The invoice will now be finalised and ready to be sent to your customer.

To convert from a draft to a real invoice without editing it, simply view the draft invoice and click the 'convert draft to invoice' link.