Add a custom calculations

Add a custom calculations
momorgan18
coût de production direct par article (sans investissement)
??rating.lastmodif?? 11/01/2018. ??rating.partinit?? Jimito13.
Expression:
(({Dépenses|N})-({Budget R et D|N})-({Budget publicité|N}))/({Production demandée|N})

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