Since you're using TurboTax Home & Business, make sure you're working under the Business tab to revise your Schedule C information. Do not override any numbers on Form 1040X or you won't be able to file the amended return.
Be sure you are starting with the return that was actually filed (no changes whatsoever) before you agree to amending your return. Also, review the instructions here: How do I amend my federal tax return for a prior year?
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