Multiple Acknowledgements for Proxy

Dear Experts,

We Have One Scenario in A Roll Out Project

That is System A  ----> SAP PO ---- > System B. A and B are SAP Systems

An order confirmation is sent to B from A with the purchase order as reference.

Requirements :

1. Order confirmation will update the confirmation tab on the purchase order with confirmation category, quantity and date.

2. How to Handle Multiple Order Acknowledgements (OA)

3. Need to be able to create a order confirmation into the purchase order even if the line has status deleted.

So if the PO has status deleted the OA integration needs to un delete the line and then create the order confirmation.

We are Using Proxy Here the Scenario is Proxy to Proxy Scenario

I am Not Good at ABAP Proxies

Please Suggest me What I have to do to Achieve the Above requirements ?

Thanks in Advance,

Regards,

Ravi