SAP NetWeaver AS ABAP Release 740, ©Copyright 2014 SAP AG. All rights reserved.
ABAP Keyword Documentation → ABAP − Reference → User Dialogs → Classic Lists →Processing Lists in the List Buffer
The statements
edit lists that are already saved as screen lists in the list buffers. Spool lists that are sent page by page to the SAP spool system cannot be edited in this manner.