Static rewrite map not working

Hi :)

I have a static rewrite map but I just cannot make it work

The lines from the config file are as follows:

            <rewriteMaps>
                <rewriteMap name="olditemsetc">
                    <add key="/items/Backpack" value="/products/bags/Backpack" />
                </rewriteMap>
            </rewriteMaps>

Am I doing something wrong?

Thanks

Karen