On 2009 Jan 2, at 8:32, Ron wrote:

Many thanks for your reply.
I forgot to mention that my Value list field is a Year plus a fund- raising campaign, thus I can’t define it as numeric, thus a negative has no effect.


Maybe, maybe not.

Let's say you have 3 fund-raising campaigns:
  Annual Campaign
  Year-End Campaign
  Guest Artist Campaign

You can calculate a negative numeric version of the year/campaign combination like this:
        NegYearCamp =
                -1 * ( Year +
                        Case (
                                Campaign = "Annual", 0.1;
                                Campaign = "Year-End", 0.2;
                                Campaign = "Guest Artist", 0.3;
                                0
                        )
                )

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