TDM lists the preferred data generation rules for a data domain. You can edit the list or add another generation rule.

When you add data generation rules to a data domain, you can enable one of the rules to be the default rule. The default rule is applicable to all columns in the data domain. To change a default rule, you must edit the data domain and enable the default rule that you want. You can also apply more than one generation rule to a data domain.

For example, an organization has a data domain called Date_of_Birth. The Date_of_Birth data domain describes the columns that contain birth dates of the customers. The organization can use the date random generation rule to generate birth dates. The date random generation rule is the default rule. The organization applies a date sequence generation technique to generate the birth dates of customers in a different table. The date sequence generation rule is a different preferred generation rule in the data domain.