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How do I use the IDoc file interface?

I want to use the IDoc file interface to read and write IDocs to and from a specific directory. While I can find this feature mentioned in the documentation, I can't find any info on how to configure it. Can you help?
For sending out IDocs via a file, you simply define a file port with WE21. The rest works just like an RFC fort.

For inbound traffic, you also have to define the file port with WE21 first. The IDocs are the read with ABAP RSEINB00 which in turn calls FUNCTION IDOC_INBOUND_FROM_FILE.
This was last published in August 2003

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