Thanks for reading this post. I solved my problem! :)
All I needed to do was changing:
Text
WHERE (PMSC.IncludeInProj='C' OR PMSC.IncludeInProj='Y')
TO
Text
WHERE (PMSC.IncludeInProj='C' OR PMSC.IncludeInProj='Y' OR PMSC.IncludeInProj IS NULL)
And then I'm fine using the where clause. I guess I can't demand everything from Crystal. What lead me on this path: http://stackoverflow.com/questions/15077053/filter-table-before-applying-left-join
