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.