QtSoap: Changing the type of a webservice object

I want to add a methodargument with a different type to my request.

My current code adds the version (int) as a string, it's working unless the server is strict with its wsdl:

Code:

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request.addMethodArgument("VersionIm", "", version);

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The desired type for this is Short, which is not available as a simple type.
I am trying to call it like this, but it is not working:

Code:

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QtSoapType* versionTag = new QtSoapType(QtSoapQName("VersionIm", version), QtSoapType::Short);
request.addMethodArgument(versionTag);

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Any hints what I am doing wrong?