This is for Nintex Workflow 2010.
In a list workflow, what exactly is the difference between the "Set Field" action and the "Update Item" value? They seem to do the very same thing, if you are updating a single field in the current item.
See the answer here as well: Difference between Set Field Value and Update Item
Although it might seem like the only difference is that "Set Field" just allows you to set one field value, while "Update Item" lets you set many, the biggest difference really is what item you are allowed to update.
"Set Field" only allows you to update the current item the workflow is running on, where as "Update Item" allows you to update any item from any list or library. So if you only needed to set one field but it needed to be on a related Item you looked up in your workflow, than Update Item is the action you will need to use. This also means the "Set Field" action is not going to work within something like a Site Workflow because the workflow itself is not associated with a single item or document.
Hope that helps
I'll pick this as the correct action. I followed the link you provided to the same question asked earlier. As I sorta suspected the real answer is... "Well, they *functionally* are similar, but have different behaviors for reasons undocumented and unknown."
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