Creating Project Record in Postman - REST API

Team - I'm encountering an error while trying to create a new project record in Postman. I've included all the mandatory fields that are required when creating a project directly in the UI.

Here's the issue:

• I'm getting an error when sending the request through Postman.
• I'm unsure if fields like "ProjectID" need to be populated when creating a record. In the UI, these seem to be generated automatically.

For reference, I included "ProjectID" : {"value" : "<NEW>"} in my request body, but it didn't resolve the error.

Could someone please advise on:

1. What I might be missing that's causing the error (406) in Postman?
2. Whether fields like "ProjectID" need a specific value when creating a record or are they indeed auto-generated?

I was referring the below link to create request, 
https://help.acumatica.com/(W(15))/Wiki/ShowWiki.aspx?pageid=13f5f5b8-33d1-40d9-83db-3f3dfc5dcba9