all of our reports have some parameters that are meant to be left null unless you want to filter the report. i am trying to set the scheduling system to email several of these reports but when i execute it i get a missing parameter values. (emailCrystalReport) error.
i need to be able to specify null in certain parameters so that it runs without any user intervention. how can i specify NULL as a value to a parameter.

Can you pass something like the word "NULL" into the parameter and then build your select expert to handle that? Something like: