Can we provide a warning while employee adds his/her contact like 'if your Contact is already listed

Summary

We have a requirement to provide a warning message if employee add duplicate contacts in his/her contacts page.

Content

When employee logs into self service My Personal Information -> Family and Emergency contacts, can we add some verbiage/warning on this page somewhere?  We are having issue with employee’s adding their spouse twice which later causes problems with their Benefits.

It seems like we don't get any warning message if employee add the same contact twice. How can we provide any validation/warning to this?

Thanks,

Karishma 

Version

20B