Thanks for your reply Hareesh.
The outboundRA is in red in Development system and green in Quality system.
However, as per my understanding, outboundRA needs to be configured only if I select 'From NWA' option in the receiver IDoc_AAE channel. In my case, I am using 'Default' option and the required Destination has been created in NWA.
I have gone through the blog that you referred to and that also discusses about outboundRA under 'From NWA' option.
Requesting your further inputs on this.
Thanks,
Aman