Forum Post: Calculate task user field from resource user fields with a conditional check

I am trying to create a task user field thats sums up the value of a user field for resources assigned to a task, but only for resources that have a a specific value in a different user field. For example, SUM(RESOURCE.UFV(“Volume”)) where RESOURCE.UFV(“Material”) == “”Concrete”, so the result is the sum of the volume of all resources with the UF “Volume” that have a value of “Concrete” in the UF “Material.” Has anyone been able to do this? I have not been able to get the SUM(RESOURCE.UFV(“”)) for any kind of conditional or attempt to filter the resources that are summed.