WS Management Interface WSDL contains dead links

Document ID : KB000094248
Last Modified Date : 03/05/2018
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The API Gateway provides a WS management interface (/wsman) for managing the Gateway via SOAP requests. I want to test/use this interface via SOAP UI. Therefore, I've published the wsman as internal service and copied the wsdl. However, it contains broken links to files located somewhere. eg.

<xs:import namespace="" schemaLocation="gateway-management.xsd"/> 
<import location="" namespace=""/>

How can I get a complete wsdl defining the wsman interface?
When you try to get the WSDL through a request to the Gateway (i.e http://<GW Host name>:8080/wsman?wsdl), it will evaluate the incoming request and replace all the broken links with correct URLs like below. 

<xs:import namespace="" schemaLocation="http://<GW Host>:8080/ssg/wsdl/gateway-management.xsd"/>
<import location="http://<GW Host>:8080/ssg/wsdl/transfer.wsdl" namespace=""/>