CE-BPM v/s PO-BPM

Hi Experts,

We are planning to upgrade our NW 7.2 system to NW 7.31, based on your

various material I understand that PO is part of the NW components.

Requirements are as below:

1> We need to trigger the BPM workflows when there is a status change in either SAP or non-SAP system

2> These BPM workflows should be interfaced on portal in the worklist of the user

Can you let me know the recommended approach for building the BPM workflows? Is it CE-BPM or PO-BPM? What are the limitations with CE-BPM?

Thanks,

Ami