Hello, I create a Duration Custom Task Field named "FV" and set a formula "= Finish Variance" to generate its data. At the beginning, I choose "do not calculate summary row" by selecting "None". Obviously,I can see MSP displays the data with the value of "0". After I choose to rollup data by using formula, MSP re-generates the data using the formula like nonsummary tasks. But, once I change the setting back to "None" , the summary rows data remain the same as that using formula instead of changing it back to "0".
Yes, I see this as well. I don't believe I'd call it a bug however as it is consistent with all custom fields. If you remove the formula [Finish Variance] form the custom duration field, you'll still see the values remain in the field that were calculated by the formula.
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Custom Fields Rollup Rule
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