I'm trying to figure out how Set Business Process Variables works.  I'm trying a very basic scenario but I must be missing something.  I created a business process called 'TEST'.

Step 1 - Fill out a form.

The form is set like this;

Step 2 - Run workflow that sets a form field to a value (Value = TEST)

Step 3 - Execute form again to approve/reject.  The value of the second field (Name and variables = AUTO_FILLIN) should be set by the workflow. (Value should = TEST)

Eventually, I want the workflow to query a database and return the values to the fields in the form.  For now, I am just trying to figure out how to return values set in the 'Set Business Process Variables' back to the form and display them in a read-only field.