You are trying to delete a connection that is used by one or more integrations (integration_name | version_number). First remove the connection from the integrations. Then you can delete the connection.
curl
コマンドを使用して接続を削除する場合、メッセージは表示されず、接続が削除されます。
curl -k -i -v -X DELETE -u icsdevics111@company.com:password https://pod_name:443/icsapis/v1/connections/TESTSOAP