The status of the order is showing as 'completed' (1). In the list of items it is possible to see only one item where sign-off has been requested - indicated by a tick in the column after the completion percentage (2). All other items are showing as already signed-off. It is likely that there was a problem with this one item on the last sign-off which required remedial attention before final sign-off was possible!
Click the Goto button (3) on the relevant line to view the item details.
Click the change button next to the confirmed percent field (1) to update the percentage signed-off.
Enter the new sign-off percentage and click OK.
As all items are now signed-off, the parent works order status has now also been changed to signed-off (1).
Back on the parent works order record you will find a new entry on the 'amounts due' tab (2) showing the amount due for the latest sign-off.