Each eDocument implementation can have it differnet way.
But most common country dependent implementations are using Application Interface Framework (AIF).
If you are also using AIF, then you can explore BADI eDocument Interface Connector (EDOC_INTERFACE_CONNECTOR). There you will find your implementation/s and you can explore & debug code. Note that often the XML is created in initial eDocument status step, saved into the DB, and then this saved XML is used for preview in eDocument Cockpit. So you might not be able to debug preview action in some cases. You need to debug "submit" or other actions.
Bluesky
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