Disadvantage of Running Value Function in SSRS

The value for RunningValue resets to 0 for each new instance of the scope. If a group is specified, the running value is reset when the group expression changes. If a data region is specified, the running value is reset for each new instance of the data region. If a dataset is specified, the running value is not reset throughout the entire dataset. Restrictions for RunningValue are also determined by the aggregate function specified in the function parameter. RunningValue cannot be used in a filter or sort expression. The set of data specified in the expression must have the same data type. To convert data that has multiple numeric data types to the same data type, use conversion functions like CInt, CDbl or CDec