selectng multiple year values from record selection

[paramsocool]

I have a @year formulae created in my report and it contains year values along with NULL values also . I am trying to select records using record selection criteria and my record selection has couple of selection parameters. I have to pick up those records that have an @year value between some range ie. like 1950 to 1980 and also the ones that have no @year value ie they have a null value. I am able to filter the records with the range year value but I am not able to pick up the blank /null value for @year as I have defined a year range for it .....

Please advice

 

[lbass]

Set it up like:

(
isnull({@year}) or
{@year} = {?daterange}
)

-LB