Hi Manggala,
have you give this code -> rs_selfield-refresh = 'X' in Form usr_command at PAI event?.
FORM usr_command USING r_ucomm LIKE sy-ucomm rs_selfield TYPE slis_selfield.
still if you facing the issue, can you paste your user_command code here?
TRy the below link
ABAPblog.com - Popup with multi-select ALV for OOALV
check have used the code ->refresh_table_display at the end of the form?
Regards,
Kannan