How to configure Autocomplete Rule for Defaulting Final Close Date Based on Employee Termination

Summary:

I am looking to implement an Autocomplete Rule in Oracle HCM Cloud for the termination process.

Business Requirement: When an employee is terminated, I want the Final Close Date to be automatically defaulted to a dynamic date calculated as:

Last Standard Process Date + 90 Days

For example:

Last Standard Process Date = 31-Jan-2026
Final Close Date should automatically default to 01-May-2026 (90 days later)

Code Snippets present in the community are older ones and not working, Can anyone please suggest the correct business object (whether it is Element Duration Dates or else) and some sample working code snippet ?

Version (include the version you are using, if applicable):