How to use Delivered autocomplete rule "Validate Department based on Business Unit".

Summary:

How to use Delivered autocomplete rule "Validate Department based on Business Unit" for all Business unit and department.

Content (required):

We have requirement to Associate departments with Business Unit. We are looking for option where system will throw error when users are selecting departments which are not associated with business unit(Association based upon ORG TREE).

There is an oracle delivered auto complete rule to ''validate department based on the business unit'. Using this rule, we can manually select a BU and few departments, this means that validating departments based on the BU from front end. The system will allow to save and submit any action if and only if the employee select the BU and the departments associated with it mentioned in the rule. If the employee select BU and a different department that is not selected in the rule, then system will throw error. Now, our question or requirement is how we can copy this