I have found no way to get the code to be "D" using step-by-step. But I can change it to "D" by editing the form.
-switch to forms view
-select the form
-click in the field to select it
-ctrl D
-then edit the field changing "O" to "D".
However, then when I do the check for errors in my return, I get two related to the two places I changed "O" to "D". I also get the error message
"Transaction code should not be overridden and changed for Electronic Filing. Using an override can prevent the cross-checking that's important to an accurate tax return."
Not an encouraging message to see.
