Invoice status
An invoice status indicates the extent to which an invoice is processed in the system.
Invoices can have one of the following statuses:
•    Edit
•    Awaiting approval
•    Rejected
•    Final
•    Invoiced
An invoice, by default, is set to the 
Awaiting approval status. To manually change an invoice status, see 
Manually assigning invoice statuses.
 | It is not possible to delete an invoice or invoice lines in the following statuses: Awaiting approval, Approved, Final, and Invoiced.  |