Entity Must Not Be NULL for HTTP Method PUT on Creation of PUT Service Connection

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We are attempting to create a new service connection to do a PUT.  Our integration is working through Postman and is simply set up to accept 2 query parameters (....../1.0/update_svcdef?SVC_NAME=[SVC_NAME-value]&URL_ID=[URL_ID-value]) and does a simple update on an Oracle DB table.  The REST endpoint of the integration is set up to return "SUCCESS".

On the service connection, we are setting:

Method = PUT

URL = same as URL above without the query parameters

Action Hint = Update

 

We are setting test values for the query parameters, but when we hit send we are getting the error: