Return the Process Orchrestation BPM in the SAP PI " waiting"

good afternoon

I am developing an Inteface LEGACY / PI / PO / LEGACY

Inbound Interface Syncrona IP data, Inbound Syncrona PO (BPM), however this not working the return of PO-BPM for SAP PI (Process Integration).

The return to the IP is in the "waiting" process rather than from continuing to send information

Someone has gone through this process?