There are 18 boolean parameters in my report. I want their default to be false through an expression when the user runs the report.
I try this but doesn't work
=SIDIdNum.Value = "false"
Getting error: SIDIdNum parameter contains error [BC30451]
Have you tried just ...
false
I'm also not sure where are you trying to set this value? If you are accessing a parameter from something other than the parameter properties dialog, you will need to use
Parameters!SIDIdNum.Value="false"
I had to customize the previous answer in SSRS 2012.
I needed to make the value: = false