How to Update/Edit DRAFT purchase order

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Hi All,

We have a requirement where we need to create DRAFT purchase orders and then update it later point of time using web services. We are succesfully able to create DRAFT purchase orders but we couldnt find any service to update the DRAFT purchase orders. 

Below is the REST service to CREATE

https://docs.oracle.com/en/cloud/saas/procurement/20b/fapra/api-draft-purchase-orders.html

Any help will really usefull.

Thanks,

Ranganadh