Resource Owner OAuth2.0 - Bearer Token Configuration

Content

Hi,

We have Token API which doesnt have Client Id & Client Secret, it has only user name & password. I tried to create connection using 'Resource Owner OAuth2.0' authorization, but got the below error when I test my API. Please find the configuration screenshot. 

{
    "type": "HTTP://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1",
    "status": 400,
    "title": "Bad Request",
    "detail": "{\"type\":\"abcs://proxy_problem/oauth/client\",\"title\":\"Missing OAuth Value\",\"detail\":\"Missing client_id and client_secret for third party server\",\"status\":400}"
}

How to achieve this in VBCS. Please note I am using OIC - VBCS.

Thanks,

Mohan