The test for the Event Rule type of custom object requires that you specify the following values in addition to the Asset Serial Number:
Event Name -- type the name of the event that you want to use for the test.
Event Severity -- type the severity of this event that you want to use for the test.
Event Message -- type the event message that you want to use for the test.
If the custom object has parameters (variables), enter values for those parameters to use in the test.