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RollupSum from $projects field based on $opportunities fields

Question asked by Laurent Laurent on Jul 17, 2015
Latest reply on Aug 4, 2015 by Laurent Laurent

I have many opportunities linked to my projects.

I would like to create a new field on the project form to calculate the sum of "Invoice Delta" to opportunities linked to my project.

I try to create a float field with rollupSum($opportunities,"invoicedelta_c") formula but the result is empty.

What is the best way to do this?