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Modified by "SYSTEM" when portal user makes changes to a record on portal


I would like to configure a workflow, that triggers and sends email only when changes are made by portal user (contact) on entity form (on portal). 

When portal contact changes field values on entity form (on portal), value of the field "Modified by" is SYSTEM - as if SYSTEM user modified the record.

I wanted to use a condition in my workflow --> if modifiedby equals SYSTEM, then send email. When I try to use SYSTEM user, this user does not appear in "Look Up Records" window - as if the user does not exist.


My questions are:

How can I access this user to use it as a condition in my workflow (I need to send an email only if portal contact made changes to the record on portal). Did anyone else face similar problems and how did you solve it? 


Is there any other way to distinguish who made changes to the record (CRM user or Portal contact user)


Thank you! 




One thing you can try is creating a lookup to contact on your record that represents the last modified by contact.  Then use Entity Form Metadata to save the current portal user to that lookup when the form is saved.


Then you can trigger your workflow off of that.

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