Dear Bernhard,
The JRC has published a mapping file here:
https://eplca.jrc.ec.europa.eu/LCDN/developerILCD.xhtml
(click on “ES2_to_ELCD”)
This was the basis for our mapping.
You also have access to the LCIA implementation report on the ecoQuery site, https://www.ecoinvent.org/login-databases.html, In the section “Files”, “ecoinvent 3.6”, “supporting documents”, “ecoinvent 3.6_LCIA_implementation.zip”.
The Zip contains a spreadsheet with the implementation, but the mapping is not included there. The mapping we prepare internally does not make sense on its own because it is read by a Python script and many operations are made implicitly by the script.
Please have a look at these documents. If you need something else related to this topic, please contact directly Guillaume Bourgault at: bourgault@ecoinvent.org.
Best regards,
Avraam Symeonidis,
Data analyst, ecoinvent Association