I’ve created a new dropdown field for the SOLine “Return Reason” but am unable to edit this field when the Sales Order status is Completed (because the workflow step prevents it). Even after Re-opening the order I’m unable to edit the SOLine that is completed including this field.
So I tried adding a new workflow:

Modifying the Open and Backorder step (the act of re-opening a Completed order puts it in the Open/Backorder status) by adding the Return Reason:

But the field still stays locked:

Am I missing something with the workflow editor?
Is there a simple parameter I can add to the DAC field?