Update client invoice
From Protemos Wiki
Client Invoice update page: http://cloud.protemos.com/client-invoice/update?id=ХХХХ (replace XXXX with the valid project number)
On this page, you can update the details of the invoice.
The availability of fields for editing depends on the status of the invoice.
If the invoice has not yet been marked as sent, you can edit "Custom code", "Payment method", "Due date" and "Note to client" fields.
For sent invoices, you can edit only "Note to client".
Discounts & extra charges
You can add discounts or extra charges to the unsent invoice by pressing “Discounts & extra charges”:
It will open Client invoice Discount & Extra charge update page.