Create a project Sub Task Using Rest API

Summary:

Create a project Sub Task Using Rest API Issue

Content (please ensure you mask any confidential information):

Hi,

I need to create a project sub Task using Rest api following the documentation:

https://docs.oracle.com/en/cloud/saas/project-management/24a/fapap/op-projects-projectid-child-tasks-post.html

I can create a task and a sub task normally using this request payloads:

Create a task :

{
  "TaskName": "3.0",
  "ExternalTaskId":"3.0",
  "ElementType":"FINANCIAL"
}

Create a sub task :

{
"TaskName": "3.1",
"ExternalTaskId":"3.1",
"ExternalParentTaskId":"3.0",
"ElementType":"FINANCIAL"
}

BUT when trying to create a sub Task Under a Task Already created by a user I faced this error

  "title": "Bad Request",    "status": "400",    "o:errorDetails": [        {            "detail": "You must enter a value for the PlanningEndDate attribute of task 3.3 (3.3). (PJF-2236232)",            "o:errorCode": "PJF:::PJF_REQ_ATTRIB"        }    ]}