Mark Invoices as Locked to prevent any further changes from being made to the Invoice.
From Orders List View select and display Invoices only
You can make a selection of Invoices and use the Bulk Action to mark them as Locked at once
For multiple Invoices at once, check the Manual on Bulk Actions
..or you can mark an individual Invoice as Locked
Click on the invoice number to access the Invoice.
Tick the box [LOCKED] and Click [SAVE]
The Locked Icon is now displayed for this Invoice
