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It was good to work with you today. I thought I'd post the workaround we came up with.
The issue is that the attribute Flow here was a time averaged value (time averaged PI Point Data Reference), and so was giving the message "The data reference for <attribute> does not support triggering calculations."
The workaround that we came up with is to add another variable to the analysis as the trigger. That trigger is a pointer to the flow PI Tag on the PI Data Archive. \\<PI Server>\<PI Tag> . This variable can then be used as the triggering point and does not have to be included in the calculation.