Possible to create an OPTIONAL multi-value field that can be left empty?

Greetings,

I have several reports for which the user has asked to have an optional muti-value parameter. They want to be able to select zero, one, many, or all values in the parameter list. The parm list is created through a query and the values are not static.

I would like to allow the user to leave the muti-value field empty if they want to allow all values to appear on the report. I've read some discussion about populating a multi-value default with the same query that produces the multi-value list values - presto, everything is selected. However, this is not a desirable solution for me because I "echo" the users parameter selections in the report heading. Selecting all values (and some parms have a lot of values) would cause the "parm feedback" section to grow large and unreadable.

In short, I don't want to tell the user they have to select everything when they really want to select nothing.

Is there any way to have a muti-value parm that won't insist the user select one or more values?

Thanks,

BCB

Make your query which is populating your parameter to have another value "All" and make that as the default value instead of an empty value that indicates all.

Shyam