When the user selects an item, and puts it on the SO, the "Class" from the item is brought over and displayed on the order item line.  However, the drop-down on "Class" is still enabled and the user can change it - sometimes by accident.

We would like to know if there's a way to "lock" the field on Item Class, so no one except maybe the Administrator can change the value. 

We can't take the field off the item line, or it doesn't display downstream, like on the SO or invoice.

Thanks -
Sara