W4 Change in ESS by employee using Portals

[M Doe]

Hello friends,
 
I have a assignment where the client wants the workflow triggered when an
employee changes their W4 info in ESS on portals.  I did some research and
there is no workflow for this situation.  Has anyone out there worked with
this scenerio.
 
Thanks in advance for your help.
 
Regards,
Monica
 
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