Problems with querying subform

Problems with querying subform

Hi all, 

I am trying to troubleshoot an issue for sometime now and still unable to resolve it.

I have a Module "Sales Orders" with a SubForm "Ordered Items" (SalesOrderModule.jpg)

Problem Statement:
When I query with zoho.crm.getRecordById to my "Sales Orders" module with the ID, it displays "Ordered Items" as "Product_Details" but in my Settings -> API -> It is shown as "Ordered Items" (API.jpg). However, the main parameter which I want to retrieve is the "Renewalble" parameter in my Ordered Items in order to process it further but even the "Renewalble" Parameter is not showing in Json reply. (Json.txt & query.jpg)

Desired Outcome:
I want to query "Ordered Items" in my SubForm and process the "Renewable" Parameter. 

There was a remote session conducted for this issue by support but the reply was undesirable as such I am still trying to troubleshoot this issue. Kindly assist please. Thank you.