Optional prompts not working

Hi All,

We are in BOBJ 4.1 SP04 and Crystal Enterprise reports.

Below is kind of filter condition am trying in a derived table in IDT.

Table.DATE = @Prompt('FromDate','D',,,,,,,Optional) AND

Table.DATE = sysdate

But it works only when I select the optional prompt value.

The requirement is to have optional From and To date prompts for date filter.

If not selected show data for past 365 days.

Thanks