ALV FORMAT

Hi Gurus,

I just want to ask on what's the use or purpose of LIST - JUST and LIST - DO_SUM and LIST - OUTPUTLEN on the following codes below.Hope you can help me with this.

list-fieldname = 'VKGRP'.

list-just = 'C'.

list-seltext_l = 'Sales Group'.

append list to t_list.

list-fieldname = 'KWERT'.

list-seltext_l = 'Condition Value'.

list-do_sum = 'X'.

list-outputlen = 20.

append list to t_list.

Thank you in advance.

Truly yours,

gerald