How to deal with "unsupported grant type" for a password field ?

Hi all,

I have a POSTMAN POST request which uses a application/x-www-form-urlencoded body type and returns an access token

grant_type:  password
scope: instance_123445
username: user.name
password: 123456

Now using ReadyAPI 2.0.1 I get a "unsupported_grant_type" error when adding the above items as request parameters and adding "application/x-www-form-urlencoded" under MediaType drop down.

How can I get this working ?

Thanks

Catalin