Add a custom calculations

Add a custom calculations
auda
Couts de production unitaire/ brut
??rating.lastmodif?? 23/04/2018. ??rating.partinit?? El-latino.
Expression:
({Coût Energie|N}+{Coût du stock|N}+{Coût matieres premieres|N})/({Production réelle|N})

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