Problem With LookUp

Iam trying to make a look up of 'ColumnA' with 'columnB' of another table .But 'columnB' has some duplicate vlaues..so lookup transmition is giving an error.

Is there any solution for this

Thanks
Niru
Findout out the solution...using Sqlquery as OLEDB Source instead of Table.This solved the thing.

Thanks
Niru
sql