IDOCs

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I am investigating about CRM Middleware and XIF Adapter.

For communication with 3rd party system I am going to use IDOCs but I have some questions about IDOCs.

I'm going to use Flat Files for IDOCs.

1. IDOCs have a header segment. In Outbound Process I think this information is filled by the system right? For Inbound Process which values need to be written by the other system in that segment?

2. I understand Header Segment have an IDOC ID. In Inbound Process which value is written there by the 3rd party system.

3. How do ALE/EDI identify that a new IDOC flat file is created in the selected location?

4. How do IDOCs identify when the IDOC is an Insert, Update or Delete?

5. Example. I expect file C:\file.txt as an IDOC file, If ALE/XIF Adapter do not read this file before the 3rd party system overwrite the file with a new IDOC this IDOC will be lost. So the question is... how can I avoid this, or how do ALE avoid this?

Thanx in advanced.

Edited by: urjose on Jun 12, 2008 6:54 PM