Seen on Windows XP with NB 55 060927_5 and JDK 1.5.0_09:

1. Start WSDL wizard. 
2. In Name and Location page, click the Import XML Schema File(s) and browse to
locate a schema that defines elements. Click Next.
3. In Abstract Configuration, change the Element or Type value for the default
parts of the Input and Output messages to one of the elements of the imported
schema.
4. Click Next

Result:
It will not allow you to select Document or RPC Literal.  You must choose RPC 
Encoded.

5.  Then select RPC Encoded, select Next and Finish
6.  Then in the WSDL Editor, modify the binding subtype to be Document 
Literal, and validate

Result: 
Validation allows you to do this.

Expected Result:
I'm not familiar with the exactly what the spec should say, but the results 
should be consistent.  If the wizard doesn't allow you to use RPC Literal and 
Document Literal, then shouldn't validation for the WSDL Editor fail as well?