Modify the data retrieval process in Create / Change Invoice that retrieves the list of Standard Order items so that the items are retrieved in order by Item Description.
Update 29 Apr 2005:
Updated so that the list is first sorted by Sequence Number and then by Description. Items where "Sequence Number" is either blank or "ZZZ" (the default for new records added through Invoicing) will appear together at the end of the list and will be sorted by Description.