You create a constraint business rule as follows:
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Select to open the List of Business Rules, and click the Add a Row tool to create a new rule.
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Enter a name and a code for the new rule, and click the Properties tool to open its property sheet:
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Select Constraint in the Type list, and then click the Expression tab.
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Enter an expression in the Server page.

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Click OK to save your changes and return to the model diagram.