Integration

I am trying to create dynamic routing in OSB to route my request to three business services. In my case, I have one webservice that has three different operations. So I created three different business services, A, B and C on that webservice(on the same endpoint URI). Now when I route my request to these businesses services based on routing rule, I want to call operationA in business service A, operationB in business service B and operationC in business service C. Here is my dynamic routing expression:

<ctx:route>

<ctx:service>{$routingTable/mapping[event/text()=$event]/service/text()}</ctx:service>

<ctx:operation>{$operation}</ctx:operation>

</ctx:route>

Here is my routing rule:

<mappings>

    <mapping>

        <event>A</event>

        <service>DynamicRoute/BusinessService/businessA</service>

        <operation>operationA</operation>

    </mapping>

    <mapping>

        <event>B</event>

        <service>DynamicRoute/BusinessService/businessB</service>

        <operation>operationB</operation>

    </mapping>

    <mapping>

        <event>C</event>

        <service>DynamicRoute/BusinessService/businessC</service>

        <operation>operationC</operation>

    </mapping>

</mappings>

For some reason this doesn't work for me. It throws this error "Error preparing message for dispatch". Looks like its not getting the value for $operation in dynamic routing. I am not sure if getting the webservice operation(method) name from the routing rule is the correct approach. Could somebody help me in this? Thanks.