Soap sender adapter show invalid content type

Hi dear mates,

I have a SOAP-JMS scenario working succesfully on 7.3.1. But in 30 min after ICM restart (usin SMICM) something wrong happend because all Soap sender adapter fails showing that error.

<text>com.sap.engine.interfaces.messaging.api.exception.MessagingException: com.sap.engine.interfaces.messaging.api.exception.MessagingException: Could not parse XMBMessage due to invalid content type for SOAP: TEXT/HTML

If I restart manually ICM still working fine until next 30 min more or less.

I have added MP transform bean to ensure that I am sending UTF-8 propertly. But it doens't work.

Does anybody know a clue why occurs this strange behavior?

Thanks in advance and regards.

José Antonio.