problem in Search Help

Hello All,

I have One Problem in search help.

I have made one search help for one 'screen field' from our Ztable. field name is 'Material no.' in this i have same no of material more then 2 times. when i am click F4 all duplicate material number also getting in search help.

i req. is, to not get depulicate values.

Thanks

Rajesh.