Hi wang
yes both tables are nvarchar,
i changed it as this way
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select isnull((OHEM.firstName),'')+' '+ISNULL((OHEM.middleName),'')+' '+ISNULL((OHEM.lastName),'')
from OHEM where CAST(U_EMPOLD_ID AS INT) = $[@IT_INVENTORY_H.U_EMPFILENO.Number]
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am getting the below error
1). [Microsoft][SQL Server Native Client 10.0][SQL Server]Conversion failed when converting the nvarchar value 'AB0001' to data type int. 'Document' (RDOC)
Regards