Change PO API

Issue: Change PO API cannot handle addition of new shipments to an existing PO Line or splitting of shipments on an existing PO line.

I have Purchasing in Oracle R12.1.1 instance. All the Payables related activities (receipt accruals, invoice creation, payments) need to be performed in another Oracle 11.5.10.2 instance.   To implement this solution, PO and receipt data needs to be sent from the Purchasing system to the AP system. This is handled using the Purchasing Document Open Interface and the Receiving Open Interface. Further all the updates made to the PO in Purchasing system also needs to be sent to the AP system. This is handled using the Oracle OOB Change PO API. This API however has a limitation that it cannot handle addition of new shipments to an existing PO Line or splitting of shipments on an existing PO line. These new/split shipments also need to be sent over to