The verifyAdmittableRequest element cannot have "xsi:nil" as an attribute.
The verifyAdmittableRequest element in XML instance can be substituted with other elements.
XML Instance
Verify admittable request message. This message indicates
the service operation that is being executed against the system.
The service being admitted. The service name is specific
to each service implementation and should be chosen to avoid
conflicts with other service implementations. These service
names correspond to the service definitions in the admin
console.