That's a neat way to do it @NicoleRonchetti . I ended up using the following, which worked, finally. Mine is column post-validate on shipped qty:
retVal = oHeaderObj.GetValue(""ARDivisionNo$"", division)
NewRtnSales = ""4181""&""-""&division
retVal = oBusObj.SetValue(""SalesAcctKey$"", NewRtnSales, ""kACCOUNT"")