Crystal Report 9 - Set to null value checkbox

[lookingconfused]

I have created a report using a stored procedure.
When the report is ran, the Enter parameter screen has a "Set to null value" checkbox. How do I prevent this checkbox for showing. Other reports I created not using a stored procedure do not have that "Set to null value" checkbox on the Enter parameter screen.

Got any ideas?

 

[synapsevampire]

The box will appear on SPs, and I don't think that you can disable it.

-k