Description
When you edit a product in existing order and click on "Automatically recalculate commissions and points for this item using price value" it was causing an error and incorrect recalculation.
 
Solution
Download the updated version of the file:
http://www.viart.com/downloads/admin_order_item-4.0.8.zip
 
Further, extract 'admin_order_item.php' file into 'admin' folder of your shop replacing an existing file. Please do not forget to make a backup copy of the current file in case something goes wrong.