I'm going to hazard a guess at this, but I may be off base, so take this answer as uncomitted :)
This appears to be a "INFO" level message, which cannot be suppressed. In tracing and serviceability there are essentially 6 levels of output:
FINESTFINERFINEINFOWARNINGERRORThe first 3 are tracing levels, should only appear in trace.log, and you can usually see a 1, 2, or 3 following the classname in the trace output. The latter three are "messages", and appear in both messages.log and trace.log, and have an I, W, or E indicator after the classname. The default trace string is "*=info", and I don't think it is possible to go coarser than this and suppress any INFO, WARNING or ERROR messages from appearing in the messages.log or trace.log output (if tracing is enabled). In this case it looks like "I" appears just after .apache.cxf.binding.soap.interceptor.SoapActionInInterceptor in the output, which makes me think it is INFO level messages output.You could try something like this as your tracing string and see if it helps:
Like I said above - I don't know if this will work because I though INFO, WARNING and ERROR were always enabled for everything, but it won't hurt to try.
Now I cannot tell you why that appears, but I strongly suspect its a developer coding error (likely in the underlying Apache library that ISVA developers cannot change) using INFO level messages when they should have been using one of the tracing levels. Again, I'm not certain - this is just a suspicion.I would suggest you open a case for it, and allow the support process to figure it out at the next level of detail.