How to Default the Business Unit based on the value of Legal Entity when creating a Requisition?

Summary:

How to Default the Business Unit based on the value of Legal Entity when creating a Requisition?

Content (please ensure you mask any confidential information):

Test case 17 has been submitted.

We knew there is a functionality can enable Business Unit on the Legal Entity setup page through the EFF below, so that Business Unit can be defaulted when Legal Entity is selected. This works well for all employee transactional pages only, but NOT for Create Requisition page in Recruiting.

So we are looking for a way to achieve the same within autocomplete rule, so that when user is creating a new requisition, when legal entity is selected, the Business Unit can be defaulted automatically. I can hardcode the rule if legal entity is A, the business Unit has to be XYZ, but it's very tedious and we have 50+ legal entities, it's a nightmare to maintain.