Change value of a Dropdown List (Order Entry ::: Lines Form)

The Order entry has few dropdown controls in the Lines Form. How can set the value of one of those dropdown via BPM so the correct discount applies. I have tried to change the ttOrderDtl field after I have looked for its name in the Epicor Help screen. The value get set to the correct display but the logic does not ran. Drop down menus has two values one is usually name value and the other is the display value. I need to set the value and not the display value.

Thanks

You actually need to assign both. The display value lets your user know what was actually set.