You cannot change the labor code or craft on Assignment Manager.
Steps to duplicate:
1-Go to Assignment Manager.
2. Select a labor record that has been assigned to a work order.
3.Change the Assigned Crew/Labor via Show Assignments dialog
4.Click Show Assignments for Labor or Craft, change to different Labor or Craft
in the dialog box.
ISSUE: When you highlight/delete the current Labor or Craft and try to type a valid one.
It takes you to the Select Value List with the Labor ex(Wilson%) and it will not find it.
Clear the skill and craft and you can type another value.