Question : Default parameter to max date

Hi, Is it possible to default a parameter to the max date?  I tried doing this in the parameter's default values, specify values expression box, but it didn't work.  I got the error aggregate and lookup functions cannot be used in report parameter expressions.  
=max(Parameters!Run_Dt.Value)

My dataset is this -
select distinct run_dt from tbl_A

Answer : Default parameter to max date

Add a 2nd dataset.  Your query will be select  max(run_dt) from tbl_A .  Then in your parameter under default choose get values from a query.  You can then choose this dataset and the field which is the max date.