Purchase Order API delivery date field is not setting

Purchase Order API delivery date field is not setting

Hi,

I am currently using your Purchase Order API to automate creating PO in Zoho Books and I am not able to send the delivery date value successfully.

Scenario:

Populate PO request due_date field per PO API (due_date | string | [yyyy-mm-dd] |Delivery date of purchase order.) 
as "2016-05-06".  I see this value is the request string to send over; however, when I open the PO,  it does not have delivery date populated.  What am I missing here ?

Thanks,
T