Need help with SOAP payload to update PO DFF with context segment

Summary:

First, what is the URL for the latest purchase order WSDL? I am using <hostname>/fscmService/PurchaseOrderServiceV2?wsdl. Let me know if this is not the latest.

Second, I am trying to update PO DFF with context segment. The request is succussing without errors, but the DFF is not updating. Let me know if the payload is correct and if any changes are required.

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I tried the below. The response was success, but it is not updating the DFF.