wsdl import - no soap header, XE8

After importing a wsdl, no TSOAPHeader classes have been generated, hence no elements  are in the request. The operation element in the wsdl:

The soap request:

	
		
			Smith
			
		
		
			
			xxx
			1.8
			
		
		
			
		
		
			
		
		
			http://ns.electronichealth.net.au/id/hi/vendorid/1.0
			XXX00001
		
	

any advice?

thanks, Bryn