How do I configure projects in Zoho Books to include expenses?

How do I configure projects in Zoho Books to include expenses?

I have created a project in Books and I've added expenses via Zoho Expenses. Those expenses are syncing correctly to Books. I can open the project in Books and see that the project cost is $1 (fixed cost) and there are $9 in expenses, which come from the entries in Expenses. 

I am using the API to retrieve the project and I am expecting to see the total project cost is $10. 

The API response shows the total is 1. However, there is a field called "is_expense_inclusive" set to 0. I would like to know how to set this to 1 (true/yes/enabled). Another field called "total_amount_expense_inclusive" is blank, and I suspect if I could enable inclusive expenses, this field would have the value I'm looking for. 

I have looked through all the documentation and all the configuration screens and didn't find any option to include expenses in the total. Has anyone achieved this or know how to do it?

API call: 
zResp = invokeurl
[
url : "https://books.zoho.com/api/v3/projects/3049437000000174115?organization_id=" + orgId
type :GET
headers:auth
];

Relevant portion of API response:
"is_expense_inclusive":0,"total_hours":"00:30","total_amount":1.0,"total_amount_expense_inclusive":""


From Books:

Billing Method
Fixed Cost for Project

Total Project Cost
$1.00

Add to dashboard watchlist
Enabled - Disable

  • Unbilled Amount
    $1.00
  • Billed Amount
    $0.00
Expense Amount

Hours Budget Type
Total Project Hours

Total Budget Hours
02:00