Unable to create issue with child objects when using children node in the request body

Ankit Kumar_w6gstt

I am using Jira Cloud instance v3 API to create an issue that has a field with child objects.
For e.g :



I am able to create an issue but the child object is not getting created inside 

customfield_10039 field as shown below. 



At the same time when I am replacing the children node which accepts array of child with the child node which accepts a single record. The child node created succesfully. 

For e.g : 

Child node inside the issue : 



But the metadata for the create issue has the children node. So, Which one is the appropriate field "child" or "children" for creating issue with child objects??