There are a few parameters that you can leverage to enable functionality for sending and archive of the purchase order request.

Here is a quick overview of the existing parameters.

AX2012 R3

Refer to this post for an overview of the cXML Purchase Order Send.

https://organicax.com/2017/02/08/cxml-purchase-order-request-send-ax2012-r3-v1/

Cheers

Lachlan