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CASA allows cloning of SU wsdl ports for local editing. However if a port is defined by wsdl references external to the SU project, then the cloning request should be rejected.
For background, see issue #164893. As a user workaround, add the WSDL/XSD of the external WSDL as file to the BPEL module (not referring as external WSDL) and then cloning the WSDL port in CASA.