Hi,

Your picture didn't attach correctly but I suspect that you should explicitly scoping your Min function, probably over the tablix or dataset.

For example Min(Fields!BALANCE.Value, "Tablix1") or Min(Fields!BALANCE.Value, "DataSet1") where Tablix1 or DataSet1 is the name of your tablix or dataset.

If no scope is specified for a summary SSRS will default the scope to the group the expression is contained in. If you need a summary to be aggregated over a parent group or object you can specify that scope. Scopes can be group names or include objects such as the Tablix or Dataset.