sql server reporting services: I'm passing a parameter to a SP in SSRS '05. The parameter values are derived
from a query that selects values based upon a group membership. What I need
to be able to do is add a value to the list so that a NULL is passed back so
that those values not belonging to the group are selected (think 'not in') .
I've tried the Null and Allow blank values on parameter tab but that does not
work. I altered by SP so that the where statements reads: WHERE GroupID is

There is a <Allow null value> radio button on the parameter tab. Is that what
you are looking for?

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