Unfortunately, there are no time-frames for any updates to installment sales originating in a prior year. The form 6252 does require deleting the form and re-entering the installment sale numbers in part one.
You can delete a form by following these steps:
1. Sign into your account and select your current return
2. Select Tax Tools on the bottom left and then Tools (see attached tax tools)
3. Select Delete a Form
4. Find the form and select delete next to it
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