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Given the use case of SplitJoin in OSB, it works with the body only and does not give options to play around with the headers.
You will have to introduce to intermediary proxy (IntProxy1/2) between the SplitJoin and proxy2/3. And you can have the logic of inserting the header in this IntProxy1/2. This way the header is passed on.
You may want to refer Oracle Service Bus 10.3 - split join how to set header for invoked service
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