It's is possible you don't need to file the amended return if your tax did not change. That would likely be the case if the code in box 7 indicated that the distribution was not taxable. I mention likely, as it is possible the IRS may question the treatment of the income listed in box 1 even if the code in box 7 indicates it is not taxable.
If you filed the amended return by mistake, it should not pose a problem since it lists no additional tax due.
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