[AccessD] data source problem

I have 2 queries to build a report. There is a parameter that picks up the
Purchase Order number.
 
The following is the first test to build the three level data source
statement made with the expression builder.
 
 
=If([SmpleSizeAll]=True,[SmpleSizeAll],"Pass")
 
When I run the report I get a parameter box asking for the IF parameter.
 
Help
 
TIA
 
Joe