Where the Internal PO Request Document is formed or published

This question is about PIP 3A4 sample buyer model. I find out that the first step ‘Wart for Internal PO Request Document’ needs to subscribe Internal PO Request Document as input. But I can’t find where the Internal PO Request Document to be formed. I have studied the service ‘wm.b2b.rn.sample.company1: Order’ and its flow ‘ProcessDocument’. But I still have not found what I wanted. Could somebody help to tell me where the document is formed or published? Thank you.

Internal PO Request Document is just like canonical document(proprietarydocument)and you have to map to a this format that can understand by your backend system.

HTH,