Hi
Try this link: http://www.idautomation.com/fonts/tools/reporting_services/#13
It's actually for Code 128, but the principle of it is the same. Basically, you need to download a custom assembly and externally reference a dll file in your report properties before the barcode will be rendered. Not sure of the specifics of your situation, but all the info you need should be at the above link.
Hope this helps!
ZBLB