Using an Enumeration Type 
You can use an enumeration type in the following:
A condition and an action in an if-then rule
A condition and an action in a decision table
An action in a rule script
A condition and action in an exclusive choice gateway
Prerequisites
You should have already updated:
Procedure
Using an Enumeration Type in an If-Then Rule
When you add a condition in an if-then rule:
In the rule editor, under If section, choose the Add icon
The default rule condition: Operation.isSuccessful() Equals true appears.
Choose the LHS value:Operation.isSuccessful() and in the drop down menu choose a definition or an alias which you have updated with the enumeration type.
When you add an action in an If-Then Rule:
In the rule editor, under Then section choose the Add icon and in the drop down menu expand an action type and in the drop down menu choose the definition or alias which you have updated with an enumeration type.
Using an Enumeration Type in a Decision Table
When you create a Decision Table
In the Decision Table wizard, in the Select the Conditions or Select the Actions screen, double-click the alias or definition or alias which you have updated with the enumeration type.
Using an Enumeration Type in a Rule Script
When you add an action in a Rule Script
In the rule script editor, choose the Add icon and in the drop down menu expand an action type and choose the alias or definition which you have updated with an enumeration type.