Since you already submitted the amendment, it would be best to wait until the IRS processes that amendment, even if it has errors. You have plenty of time to file the amendment and as pk mentioned above, the IRS knows you are taking curative action to rectify the situation. There is no reason to start a second amendment at this point; it will only further complicate matters.
Once the erroneous amendment is processed, the IRS will likely notify you of the missing Schedule C again. At that time, you should have all the information you need to prepare a corrected return. @js733
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