I'm trying to define some criteria in process builder that checks to see if a user was selected in an Assign to User custom lookup field. However, process builder won't let me select that field for the criteria. I am required to traverse the lookup field and select a field on the user object. Is there a way around that? I just need to check if that field != null.
You need to scroll down a little bit and you will find the field Assign to user.
What you are seeing in image is relationship field.