How can I disable SSL certification verification or allow empty issuer CN self-signed certificate in SoapUI?

I am asking this question because I encountered an issue while I was using SoapUI to sending a soap/json request to a HTTPS web service API which was installed with an empty issuer CN self-signed certificate at the server side.

This is the sample api link:

https://auth.sandbox.cloud.xyz/auth/v3/oauth/token?grant_type=client_credentials&client_id=auth_api_client&client_secret=client123

SoapUI returns following errors after I clicked send request button. The service api response wasn't returned.

INFO:Error getting response for [https://auth.sandbox.cloud.xyz.Token:Request 1]; javax.net.ssl.SSLHandshakeException: Failed to parse server certificates ERROR:java.security.cert.CertificateParsingException: Empty issuer DN not allowed in X509Certificates

Same api request call works good in Postman as long as I disable its SSL certification verification.

In Postman, there is an option "disable SSL certification verification", you can use it to disable SSL certification verification while you are sending a soap/json request to a HTTPS web service API.

However, I am not able to find the similar option in SoapUI. 

Does any one know how to disable SSL certification verification in SoapUI?

Or, how can I send request and get its response successfully against a HTTPS web service API which is installed with an empty issuer CN self-signed certificate at its server side?

Thank you so much for your help!