Hi Ben,
Thanks for help. I have the screen capture of actions:
http://imgur.com/a/ERr9Q
Those BillLineItem are all saved, and synced to QBs already. I also tried to update "Customer" with a hard-code customer name, the system has no warning/error, however, the field are not modified.
By the way, "Customer" is a dropdown, what if I want to clear it as NULL (or empty) what value should I set? I'm asking is because if I set this value as blank, QBs will assign it a value we want after synchronization. Thanks again!
Alex