Hi Sandra and Juan,
Thank you for providing so many details, looks much less uncertain about your configuration. One other thing I noticed: in deployed libraries that you have in com.sap.aii.adapter.lib, there is no geronimo-jms_1.1_spec-1.1.1.jar. It shall be located in the folder "dependencies" in the distribution of JMS Connector for RabbitMQ. Can you please deploy it, too?
If this will not resolve an issue, can you please collect verbose trace of the affected JMS receiver channel (e.g. using XPI Inspector), so that we can together have a look and try to figure out why submitted parameters are ignored by connection factory class?
Regards,
Vadim