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Grouper SOAP uses auto-marshaling from Axis2 which does not support conditional fields (if null, it send back the field and says it is null). So there is a new source path for 2.0, WSDL, and a new endpoint, aar, build script entry, etc. The 1.6 WSDL is on the 2.0 server under the same name, the new one is:GrouperService_v2_0.wsdl. the new WSDL does have a new target namespace too:
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Bottom-line, the SOAP and RESTlike web services are completely backward compatible, and for SOAP, if you are coding against 2.0 (or upgrading), change the endpoint URL from GrouperService to GrouperService_v2_0. Note, it will be 2.0 until there is a change that is not backwards compatible... that might be 2.1, or 2.2, or whatever.
Developer information
Note, this means developer as in developers who work on Grouper itself, not developers who are writing web service clients or implementing Grouper.