Exchange header data from sub-route is not available in the camel main-route

Question

This is my main-route,

.process(startOperation(DISTRIBUTION, GET_HOTEL_AGGREGATOR_RATES_API_MOM))
                .log("Calling CredentialRoute")
                .bean(AggrHelper.class, "getCredential")
                .log("Making parallel calls to vault")
                .multicast()
                .parallelProcessing()
                .to("direct:AgencyCredentialProcessing", direct:LocalCredentialProcessing")
                .end()
                 .bean(RatesPreProcessor.class, "preProcess")


        from("direct:AgencyCredentialProcessing").errorHandler(noErrorHandler())
                 -- setting value in exchange header, which came from main route
               .end();

Now i'm setting a value in the exchange header on sub-route(direct:AgencyCredentialProcessing), is not available once the control goes back to main-route. What configuration changes i need to that exchange changes in sub-route scope should be visible on main-route also.

Thanks in Advance, Raghavan

You need to use an aggregation strategy on the multicast, where you can control what data to merge together as the result of the sub-routes and to use for continued routing in the main route. The multicast uses by default the latest response. — Claus Ibsen, Mar 15 '19 at 04:58

Exchange header data from sub-route is not available in the camel main-route

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