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Modeling a Business Rule 
You can use this procedure to define business constraints that you want to impose on business objects or their properties.
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1. In Solution Explorer, expand the Business Library node.
2. Click the Business Rules node with the secondary mouse button and choose New.
The Add Object window appears.
3. In the Templates: frame, select the necessary template.
The template determines the type of rule the system has to create; for example, an object rule or a property rule.
4. In the Name field, replace the default name of the business rule with a meaningful name.
5. Choose Open.
The Document Outline window and the Code Designer appear. The Document Outline window displays the new business rule.
6. Write code for the business rule in the appropriate location within the Code Designer.
7. Choose Save.
You can associate the business rule, which you have modeled, with a business object or business object property. (See, Associating a Business Rule to a Business Object or its Property.)