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Interfacing SAP and legacy systems using IBM Connector

I am trying to interface SAP with a legacy system using IBM Connector and ALE/IDoc interfaces. My requirement is to create PO/PR/GR/LIV docs in SAP R/3 and return the Document number back to the legacy system. I am using ALEAUD message type to return IDoc number and status back to sender (legacy system.) How do I send SAP Document numbers of the newly created SAP documents back to the sender system? Since ALE is async communication, how do I handle this?
When the transaction support NAST messaging, customize a new output message for ALE that is created with the document. This poutput message the sends out ALEAUD etc. (in case of PO, better send the ORDERS03 as aorder acknowledgement.)

A detailed explaination of how this can be accomplished is part the following IBM Redbook:
Lee Gavin, Axel Angeli
A B2B Solution using WebSphere Business Integration V4.1 and WebSphere Business Connection V1.1
http://www.redbooks.ibm.com/redbooks/SG246916.html

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