IDoc Tunneling and XML_CONVERSION

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Hi,

I'm developing a File 2 IDoc / IDoc 2 File Scenario.

The Partner who receives and send files wants to use the idoc flat table structure.

I noticed that wasn't so easy to convert IDoc XML to flat file, till i found IDoc Tunelling which perfectly fits my scenario!

The research i've done, explains that we just have to set the IDOC / XML_CONVERSION parameter:

Possible Values

<i>'0' Every IDoc is saved as a table; no IDoc-XML conversion

'1' Every IDoc is converted to IDoc-XML

<b>'2' An IDoc is converted to IDoc-XML if requested by the service</b></i>

But, setting value to '2', how can i control if i want or not Xml conversion to occur? Is a setting made in R/3 or XI?

I have scenarios where i really need XML (to use mapping features). Value 2 looks perfect, but where is this controlled?