Good morning !
In the transaction WE20 to create the customer EDI KU with EM function.
Output parameter: message type DESADV and basic IDOC DESADV01.
I associate the IDoc message type to LAVA, you should link it to the XML file, that is not how.
Please : Could you please explain how you linked the XML file to IDOCS to create sales order ?
Sorry for my poor English
A greeting.