DFS1726I SC=04 VERTICAL TABBING MAY NOT BE VALID IF EJECT (BGNPP) OR EJECT (BGNMSG) NOT SPECIFIED

Explanation

Vertical tabbing only has meaning relative to the beginning of a new page. If the PAGE= parameter does not force a new page at either a new message or physical page, vertical tabbing might not be valid. Alternatively, all programs could specify EJECT (ENDMSG).