We know the seeded BPEL flow allows an approved PO from EBS flow into OTM as Order Base and then release it into an OR which is planned and tracked as shipments. My question is that since there is no flow back from OTM to EBS with what was shipped then, how do clients know when to pay their suppliers and how do they track inventory?

From anyone's experience working on this interface,If there is any custom interface that needs to be developed for the flow back then what is sent back to EBS and to which object it is mapped?
Any pointers is highly appreciated.