SAP PO EDI Vendor confirmation LA

Hi Folks,

Business requirement is to receive confirmations from the vendor via EDI and perform update in the PO.

Confirmation Category:

1) AB - for ORDER CONF

2) LA - for ASN

I would just like the PO confirmations tab to get updated with AB and LA. (without any delivery creations)

When I use basic type ORDERS05 and message type ORDRSP, I am able to successfully add AB.

However, I am not able to add LA.

What basic type/message type do i use for it? AND what data to I specify in it so LA will be added to the PO.

Thanks a bunch for your help in advance.

-Syed