'Previous Month Sum of values for a scenario

Trying to add a summary line for the previous months totals in a tablix where the months are in rows. I get an error.

=Previous(Sum(IIf(Fields!Scenario_Name.Value="Activity Actuals",Fields!BOE_volume.Value,0)),"planning_month")

The "planning_month" is the Column Group



Solution 1:[1]

Needed to add CDEC to the expression to handle any issues with number formatting

=Previous(Sum(IIf(Fields!Scenario_Name.Value="Activity Actuals",CDEC(Fields!BOE_volume.Value),CDEC(0))),"planning_month")

Sources

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Source: Stack Overflow

Solution Source
Solution 1 SteveE