Error running query inside data-config.xml

[con]

Hi Guys
 I am trying to take values by connecting two tables. My data-config.xml
looks like:
<dataConfig>
        <dataSource ***** />
                <document>
                        <entity name="emp" query="select * from EMPLOYEE"> 
                                <field name="features" column="EMPID" />
                                        <entity name="grade" query="select * 
from EMP_GRADE, EMPLOYEE where
EMP_GRADE.EMPID='${emp.EMPID}'">
                                                <field name="features" 
column="SALARY" />
                                        </entity>
                        </entity>
                </document>
</dataConfig>


If I try to index the values from a single table, it is working fine. Is
there anything wrong in the above configuration:

Thanks in advance
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