Hi:
The procedure that get generated behind the scenes of the List Data task is PROC PRINT. The only way to wrap a long text field using PROC PRINT is with the CELLWIDTH style attribute, as described in these forum postings:
http://support.sas.com/forums/thread.jspa?messageID=7442ᴒ
http://support.sas.com/forums/thread.jspa?messageID=7435ᴋ
http://support.sas.com/forums/thread.jspa?messageID=7403ᳫ (Example 1)
If you are creating a TXT file (LISTING destination output) with PROC PRINT, however, then the CELLWIDTH style attribute will NOT work -- because the LISTING destination does NOT use ODS style attributes.
The forum posting for #7403 has some sample code (Example 1) that you can use to see the difference between using a format with PROC PRINT and using the FLOW option with PROC REPORT.
cynthia