A friend passed me a link to this article - Design Challenge: Rules on Rules by Steve Hoberman in DM Review. Steve makes some interesting points as to where to put different kinds of rules, in particular when not to enforce rules through the data model. He outlines a nice test for this and gives a good example of what I would call a business rule. Of course I would say that not only should these kinds of rules be enforced outside the data model, they should be managed in decision services as enterprise assets.
You might enjoy this post on BI and rules and this one on various ways to use rules
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