Pip 3A4 PO Confirmation

I like to know any of you have experience to to send Pip 3A4 Purchase Order Request and 3A4 PO Confirmation to trading network within one box, but inbound document not recognized by TN. I don’t have preamble part of my inbound document(3A4 Inbound), I am trying to use CID that was assign by TN to 3A4 outbound, but system dosn’t understand document type, sender and receiver ID.