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Defining the Conditional Expression

Set up the basic comparison in the validation rule. On the Validation Execution tabbed page, enter the formula Sal!=null && Comm!=null in the Conditional Execution Expression text box.

This text box causes the rule to be applied only when the specified condition is true. Note that the expression is case-sensitive.

In the Triggering Attributes section, select Sal from the Available Attributes list, and click the Add (right-arrow) button to move Sal into the Selected Attribute list, along with Comm. At run time, when the value of any attribute in this list changes, the rule is reevaluated.