Facing problem in adding a resource to resource breakdown structure via Rest API

Summary:

I am trying to update a Resource Breakdown Structure using Rest API. I am trying to add a new Planning Resource (a person name) to an existing Resource Format (Named Person

) of a Resource Breakdown Structure using the below API, but getting some error. I have attached the screenshot of Payload and Error Response, as well as the UI screenshot from Oracle Fusion screen where I want to do this update.

Rest API (Method:Post): /fscmRestApi/resources/11.13.18.05/projectPlanningRbs/{projectPlanningRbsUniqID}/child/Elements

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):