After you open the amended return (you should not amend the return until the original is completely processed) you just need to go through the company information again. After reviewing all of the screens with information about the partnership you will come to a screen that says "About your business" with a series of selections on it. The first one is that this is the final return. Change that answer to yes and it will check the box on form 1065X for you. Then you can submit the return.
@joker0113
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