I am trying to get data from different data sets into a single tablix.Since I am not using the primary data set , I know I have to refer to fields in the current dataset scope. But I want to look into all status and based on their color need to sum.This is the expression from second dataset :=iif((Fields!Status.Value, "Mailbox") = "Red",SUM(Fields!ID.Value, "Mailbox"),0)This expression is throwing an error,If I use first (Fields!Status.Value, "Mailbox_New") , it work, but I have to look at all values and then SUM(Fields!ID.Value). IS there an expression that looks into all the values, instead of only the first one.
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