List Lookup in Task Form showing selected Value from Item Form?

[joese]

Within a (Request review) task form, I need a List Lookup control to show the value which was selected in the form of the list item that the workflow is running on.(See also the attached screenshot)

I know I could use a calculated value, but I want the reviewer to be able to change the value if necessary...

How can I achieve this?

Thanks in advance!

(Nintex Workflow & Forms 2010)

[emha]

This should work OOTB.

Make sure the form control is connected to source list field.

resp. the most reliable way is to drag&drop the control  from 'List columns' left hand pane.