WSO2 API Manager methods are not loaded from WSDL - soap

I'm trying to proxy an SOAP EPR using API Manager.
I follow the procedure of creation of REST API "I have a SOAP End Point" and I provide the WSDL. but in the "design" tab i can't see the methods. Seems like API Manager "does not understand" the WSDL I provided.
I can browse The same WSDL and I used SOAPUI client, the WSDL is correct and I can see the methods and test them.
Does anyone exerienced this kind of issues with API Manager?
Best regards.

Before APIM 2.2.0 you will see only a single resource.
Enhanced support for exposing SOAP services as REST APIs by auto-generating the REST interface by parsing the WSDL of the SOAP Service was introduced in APIM 2.2.0.

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