Starting with Visual Studio.NET 2003, several of wsdl documents included in the SDK generate warnings when compiled with wsdl.exe at the command prompt. The warnings arise when compiling WSDL documents with complex types with a restriction base of SOAP-ENC:Array. This is a SOAP v1.1 supported encryption type.
There is no information on this warning (at this time) in the Microsoft knowledge bases. It has been verified that these warning have to do with using the SOAP v1.1 schema encoding and an issue wsdl.exe's parsing of them. The same behavior can be seen by compiling several wsdl documents available from http://www.xmethods.com as well.
It has been verified that these warnings are just informational and the correct generated client code is generated and functions properly.
When all the supported client toolkits include support for SOAP v1.2, we will move to the new encoding schema and this should remove the warning messages.