Is it possible with this version to relay the SOAP headers from the request to the producer endpoint?
Yes, have a look at the issue CAMEL-1474 for more detail.
but is there a simple way to have this header propagated in MESSAGE or PAYLOAD modes?
Here is another issue that was fixed for soap header in PAYLOAD mode: http://issues.apache.org/activemq/browse/CAMEL-1088
Thanks for the reply. In my testing, those methods only worked for POJO mode.
I managed to enable the feature in MESSAGE and PAYLOAD mode by adding in the SoapPreProtocolOutInterceptor: