I had the same problem but finally I found the solution :)
Add the following tags in axis-config.xml right before the transport tag:
That should do the trick for all your webservices.
If you just want to remove multirefs for a certain webservice, then you have to change the web-service.xml file for that webservice instead. Add the parameter tag above in the service tag and you will have no multirefs for the webservice.
The browser removed my xml info. :(
The tag before transport should be named globalConfiguration and have a child-tag named parameter with name sendMultiRefs and value false.