How to auto reject expense claims raised by contingent worker

Summary

How to auto reject expense claims raised by contingent worker

Content

I have a business case where few of the contingent workers (CWK) will be allocated with the Employee role as they act as PAs to CFOs and CEOs and will be creating expenses on-behalf of them.

However, if they create expense claims for themselves then they should be auto-rejected.

If there any BPM rule available to check the Person Type of the Expense Owner (not the preparer)?

Version

19C