Soap Body is not SIGNED

[machnst1]

From time to time we are getting Soap Body is not SIGNED from
/oxalis-api-6.3.0.jar/network.oxalis.api.outbound/Transmitter.class
Stacktrace:
http://docs.oasis-open.org/ws-sx/ws-securitypolicy/200702}SignedParts: Soap Body is not SIGNED
at org.apache.cxf.ws.policy.AssertionInfoMap.checkEffectivePolicy(AssertionInfoMap.java:179)
at org.apache.cxf.ws.policy.PolicyVerificationInInterceptor.handle(PolicyVerificationInInterceptor.java:102)
at org.apache.cxf.ws.policy.AbstractPolicyInterceptor.handleMessage(AbstractPolicyInterceptor.java:44)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
at org.apache.cxf.endpoint.ClientImpl.onMessage(ClientImpl.java:829)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponseInternal(HTTPConduit.java:1726)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponse(HTTPConduit.java:1592)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1389)
at org.apache.cxf.ext.logging.LoggingOutputStream.postClose(LoggingOutputStream.java:53)
at org.apache.cxf.io.CachedOutputStream.close(CachedOutputStream.java:228)
at org.apache.cxf.transport.AbstractConduit.close(AbstractConduit.java:56)
at org.apache.cxf.transport.http.HTTPConduit.close(HTTPConduit.java:689)
at org.apache.cxf.interceptor.MessageSenderInterceptor$MessageSenderEndingInterceptor.handleMessage(MessageSenderInterceptor.java:63)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
at org.apache.cxf.endpoint.ClientImpl.doInvoke(ClientImpl.java:528)
at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:439)
at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:354)
at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:312)
at org.apache.cxf.endpoint.ClientImpl.invokeWrapped(ClientImpl.java:347)
at org.apache.cxf.jaxws.DispatchImpl.invoke(DispatchImpl.java:322)
at org.apache.cxf.jaxws.DispatchImpl.invoke(DispatchImpl.java:241)
at network.oxalis.as4.outbound.As4MessageSender.invoke(As4MessageSender.java:105)
at network.oxalis.as4.outbound.As4MessageSender.send(As4MessageSender.java:89)
at network.oxalis.as4.outbound.As4MessageSenderFacade.send(As4MessageSenderFacade.java:20)
at network.oxalis.api.outbound.MessageSender.send(MessageSender.java:59)
at network.oxalis.outbound.transmission.DefaultTransmitter.perform(DefaultTransmitter.java:149)
at network.oxalis.outbound.transmission.DefaultTransmitter.transmit(DefaultTransmitter.java:106)
at com.opuscapita.peppol.outbound.sender.network.NetworkSender.send(NetworkSender.java:45)

Sometimes just a resend works and sometimes we need to wait a couple of days before the resend is working (??)
But i think 100% of the messages finally can be resent, sometime you just need to wait.

Do you have a clue what is causing this? can it be related to this version (6.3.0)?

Br
Stefan Machnow, OpusCapita