Character problem with axis2 - rampart 1.3

Hello!

I've made a ws-security client which is communicating to a Websphere webservice with signed body, using x503Token. It works fine if the body doesn't contain any non iso-8859-1 characters. But if it contains I've got org.apache.ws.security.WSSecurityException: The signature verification failed exception. The server sends the answer in utf-8 and it sets context-type to text/xml; charset=utf-8. The received message is also good, when I take a look at this line in the log: org.apache.rampart.MESSAGE.invoke:78 - *********************** RampartReceiver received. But later in the log it becomes wrong here:org.apache.ws.security.message.EnvelopeIdResolver.engineResolve:145 - exit engineResolve, result: XMLSignatureInput/Element/

Difference in the lines are the following:
<errText>A Casco szerződés nem élő.</errText>
<errText>A Casco szerződés nem élő.</errText>

Anybody has idea what can I do with this problem.

Thanks for the answers
Laszlo