Configure exception test data parameters to generate null and values that are not valid.
Select a global rule that you previously saved or select default to generate random null values and values that are not valid. Invalid values are data values that do not conform to the generation rule.
For example, you want to create a random date generation rule that generates 85% of the dates between 2012, and 15% of the dates between 2005 and 2010. You create a rule called Dates_2005 that generates dates from 2005 to 2010. You save the Dates_2005 rule. You create a rule called Recent_Dates that generates dates from 2012 to 2013. When you create the Recent_Dates rule, you select Dates_2005 in the invalid values parameter and enter 15 in the percent parameter.
You cannot generate null values for MongoDB sources.