To allow nullable parameters on a Microsoft Reporting Services report, add an extra row for all product models:

— Dataset 2
select
   
null as ‘ProductModelID’,‘[All models]’ as ‘Name’
union select pm.ProductModelID, pm.Name
from
   
Production.ProductModel pm
order by Name

Solution found at: http://www.discombobulator.net/index.asp?article=9

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