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@sjrcpa wrote:

No. This is ProSeries' policy.

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I don't know this for sure, but I suspect it is a TurboTax policy.  They don't want users of TurboTax to screw things up (and to prevent tax returns being fraudulently amended by criminals), so they added that limitation.  ProSeries uses the same "tax engine" as TurboTax so that ridiculous limitation is also part of ProSeries.