An order got entered with the wrong Price Code.  This very seldom happens.
 
We went in and changed the header screen to the correct price code and a dialog popped up that said:
    "For this new price code to take effect please tab thru all the line items."
 
We did that; some of them changed, and some of them did not.  
 
If I add a new line item with the same item number as one of the existing ones that did not change, it DOES show the correct price.
 
How do you force a line item to re-lookup the price based on the sales orders CURRENT price code?
TABing through them does not seem to be enough.