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The formula presented in the eco-score [https://docs.score-environnemental.com/methodologie/produit/transport document] needs to be adapted to take the ''multi-sourced'' case into account.
 
The formula presented in the eco-score [https://docs.score-environnemental.com/methodologie/produit/transport document] needs to be adapted to take the ''multi-sourced'' case into account.
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  Score (purchase, production, origin) = <big>Σ</big><sub>i=1</sub><sup>N</sup>
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  score<sub>final</sub>(purchase, production, origin) = score(purchase, production) <big>Σ</big><sub>ingredient=1</sub><sup>N</sup> score(ingredient,production) fraction(ingredient) / score(production,?)
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* score depends on the purchase location, the production location and the origin location of each ingredient.
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* score<sub>final</sub> depends on the purchase location, the production location and the origin location of each ingredient.
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* score(purchase, production) depends on the production and purchase location. If both are the same this is 100, otherwise it should be lower than 100.
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* ingredient is an ingredient in the product. So the sum iterates over all ingredients comprised in a product.
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* score(ingredient, production) is the score for getting the ingredient to the production location. If both are the same country this will be 100.
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* fraction(ingredient) is the fraction of the ingredient in the product. The sum of all fractions should be 1;
    
== Calculation method ==
 
== Calculation method ==
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