how to get DraftPurchaseOrdersUniqID to use Draft Purchase Order API

Summary:

We are trying to update Requester on Open PO using DraftPurchaseOrder RESE API. We need to know how to query DraftPurchaseOrdersUniqID.

Also can we update Requester on the Open PO using Draft Purchase Order API without generating change order.

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Version (include the version you are using, if applicable):

23 C

Code Snippet (add any code snippets that support your topic, if applicable):