If it is saying there is a duplicate, go back to the Income and Expense section of the Federal section. Click on "Review" or "Edit/Add" whichever is shown. Click on the "Edit" button for the W2 in question. Click through the screens until you get to the Box 14 entry and look to see what is entered. If you see something that is a duplicate entry, delete the duplicate entry. If you do not see anything that is duplicated, then I would suggest that you continue through the screens until you are back to the list of W2s. I would then delete the W2 in question and then re-enter the W2.
