Hi,

So this workflow is called from a business process to insert input values into a lookup table. By default the lookup table's rows don't have an integer ID (just a key-which I have no idea on returning ASC) so I have that setup in my lookup table. I return the row ID back to the BP as I update the same row later in the process through another workflow by using the ID value. I checked other workflows that are similar, and I get the same visual error, but it works as intended. 
I tested this today and it also worked:


I don't think if I selected "Set output values with Assign Token Values activity", workflow would know what variable to send back to the BP. So, I guess I'm just bringing it up for awareness. My workflows work as intended.

edit: I see now what you meant. You actually have to go into the Assign Token Values and modify there.