[Mono-list] wsdl2 throws R2718 warning, but cannot find why

[Alex Villací­s Lasso]

I am writing a webservice that will be implemented server-side in PHP 
and consumed by (at least) a C++ binding and a Java binding. As this is 
the very first time I write a WSDL document, I am trying this file with 
various WSDL parsers to weed out inconsistencies. When using wsdl2 from 
mono 2.4.3.1 on Fedora 12, I get this warning:

--------------------------------------------
[alex at srv64 test]$ wsdl2 ../elastix-taskbar.wsdl
Web Services Description Language Utility
Mono Framework v2.0.50727.1433

There where some warnings while generating the code:

   ../elastix-taskbar.wsdl
     - This web reference does not conform to WS-I Basic Profile v1.1
         R2718: A wsdl:binding in a DESCRIPTION MUST have the same set of
         wsdl:operations as the wsdl:portType to which it refers.
           * Binding 'ElastixTaskbarSOAP', in Service Description
             'http://www.elastix.org/webservices/elastix-taskbar/'

Writing file 'ElastixTaskbar.cs'
[alex at srv64 test]$
--------------------------------------------

However, I fail to understand why the warning is issued with the WSDL 
document I built (attached). Is wsdl2 correct in issuing this warning?
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