Cannot combine System and Unit Ecoinvent databases

Question

Hello,

I have a significant problem. I have been working with combined databases of Ecoinvent (System and Unit), unfortunately from 3.11 version i am not able to combine them. I saw that there were a problem with 3.9.1 version with overlapping UUIDs. I checked 3.11 version and the same problem exists here. What can i do in this case? Is there any tool to change UUIDs globally for entire database?

Answer 1

Which system model and which Nexus release version of ecoinvent 3.11 are you talking about?

The latest Nexus release from 31.01.2025 should have random and different UUIDs numbers for processes in the system process databases so that it can be merged with the unit process database. However, I would still suggest to only use the unit process database, since copying, backups or searches will be much quicker and there is very few arguments to work with the system process version alone or combined.

Comments

I  am talking about 3.11 version with EN 15804 addon from April 2025

Thank you for suggestion, but from my perspective it is very valuable to use both of those versions combined :)