If you enter a item number that doesn't exsist, select NO to the "do you want to add it" prompt and then try to change the item number, you get a "cannot change item number on WO that has been saved" message. You have to exit out of the incomplete WO and start over.  
Due to my old age and fading faculties, I sometimes enter a item number incorrectly.  As you have not completed entering the WO, you should be able to go back and edit the item number.

As the bad part number is not in the system, there in no description.  Therefore, when you answer no to the "add item number" prompt, you are back on the item block on the screen.

Quote from Vman   on 03/07/06 at 09:12:40:

 
Than just delete the bad part #, move up to location than back down. It will than except a new part #.
 
John

Quote from David Waldmann   on 03/07/06 at 09:51:13:

 
It works here. I have to use it often with my FAT fingers. I say no to adding a new part#, the bad # is highlighted and I hit the delete key. Up one down one, good to go. Maybe because I have multiple locations?
 
John