There must be more to it than this, since there is no reason why two withholding amounts can't be the same.
OK, did you enter any estimate tax payments for Indiana?
If so, are the dates different (the values can be the same).
Can you give us the exact error message?
Can you tell us where this message occurs? Is it in the federal or state review? Or is it in the interview as you are trying to file?
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