Problem in Select options.

Hi,

I couldnt able to select the values in select options. for the below code..

can anypne pls tell me what might be the error in generating.

tables : vbak,vbap.

data : begin of itab_vbak occurs 0,

vbeln like vbak-vbeln,

auart like vbak-auart,

netwr like vbak-netwr,

waerk like vbak-waerk,

end of itab_vbak.

data : begin of itab_vbap occurs 0,

zmeng like vbap-zmeng,

zieme like vbap-zieme,

posnr like vbap-posnr,

matnr like vbap-matnr,

end of itab_vbap.

select-options : s_vbeln for vbak-vbeln,

s_vkorg for vbak-vkorg,

s_vtweg for vbak-vtweg,

s_spart for vbak-spart.

Initialization.

start-of-selection.

select vbeln auart netwr waerk

into table itab_vbak

from vbak

where vbeln in s_vbeln.

loop at itab_vbak.

write : /20 itab_vbak-vbeln,30 itab_vbak-auart,35 itab_vbak-netwr,

60 itab_vbak-waerk.

endloop.

Stalin