Calculated field configuration (EVAL) not working in props.conf

I am trying to use a filed in calculated fields from props.conf to replace space in one of my field values but not getting any results in Splunk 6.2. Below is EVAL stanza from props.conf - EVAL-Customer_Id_New=replace(Customer_Id," ","") Not getting any new field "Customer_Id_New" in interesting field for that sourcetype. Please help me if you can. Thanks in advance