Multiple values in selection screen

Hi all,

I have got the vendor parameter in the selection screen. If multiple values are entered using the dynamic selection icon in the selection screen, its not working ..plz help..

select-options : s_lifnr for lfa1-lifnr.

*- To select the open items data from BSIS.

select belnr blart budat xblnr dmbtr sgtxt rebzg shkzg qbshb lifnr

from bsik

into corresponding fields of table it_bsik

where bukrs eq p_bukrs and

gjahr eq p_gjahr and

budat in s_budat and

gsber eq p_gsber and lifnr in s_lifnr.