Contribution tree (product system) and Results (project) do not add up

Question

Hello, 

The results at the contribution tree (at the product system) are not the same as the results (at the project level). I created the process myself and got 3.89E6 kgCO2eq for climate change (long term) at the contribution tree and 4.95E6 kgCO2eq at the results, for example. I have added the providers from Agribalyse and the model graph seems ok, so I cannot see what else could have gone wrong. I use the same impact assessment method [i.e., ImpactWorld+ (midpoint)] and functional unit in both cases. Why would this be? 

Screenshots of the contribution tree (product system) and results (project) for climate change (long term) are below:

Thank you for your help!

Comments

Did you use the same allocation method?

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Thanks for your help, that was the issue! I see that 'None' was selected at the project level but 'As defined in processes' at the product system. When I select 'As defined in processes' at the project level, I see the same results!