VMI:Purchase Order creation

Hi

I have received a requirement from client for the setting up of VMI process ,wherein upon vendor confirmations ,PO is to be created in SAP.

I have found out following settings in R3 :

1) "order by vendor" in vendor master

2) usage of ORDRSP.ORDERS05  Message Variant : VMI process code ORDS in partner profiles

3) settings in WVM7 for Pur.Org. , doc type assignment for vendor.

Still after this i am not able to create POs,when i am testing in WE19.

Can you please help me if i am missing any config or if possible can share the inbound idoc mapping.

Thanks in advance

Rahul