How to get value of header set within a splitter ?

Issue

• My Route is mainly reading lines from a csv file.In my Route I am trying to store "DATE" value in the header as constant and then trying to use it when it reads the next line. some how I am not able to do that can you please tell me what is wrong with the code.

<route id="_process">
            <from id="_to2" uri="direct:process"/>
            <choice id="_choice2">
                <when id="_when2">
                    <simple trim="true">${body} contains 'Report'</simple>
                    <bean id="_bean1" method="extractDate" ref="dateExchanger"/>
                    <setHeader headerName="CurDate" id="_setHeader1">
                        <constant>${body}</constant>
                    </setHeader>
                </when>
            </choice>
            <log id="_log2" message="Date -> ${header.CurDate} -- ${body}"/>

• Output

INFO  Date -> ${body} -- 11/05/2016
INFO  Date ->  -- ABRZ,MAX Employment Casuarina,35,16,69.86,91,Local Market Local