You can apply business rules that you have created to your model objects.
Open the property sheet of an object, and then click the Rules tab:
Click the Add Rules tool to open a selection window listing all the business rules available in the model:
Select the business rules you want to add to the object, and then click OK to return to the object's property sheet.
Click OK to close the object property sheet and return to the model.
Note:
When you apply a business rule to an object, its U (Used) column in the List of Business Rules is automatically checked. This column allows you to see what rules are unused, and delete them if necessary.