Since your return has already been accepted, you will need to wait until it is fully processed before filing an amendment.
You can try to cancel the scheduled California direct debit through your FTB MyFTB account, or by contacting the FTB at least two business days before the payment date.
If the payment is processed, it'll simply be credited to your account and reconciled when you amend your tax return.
Once your tax return is completely processed, you can Amend (Form 1040-X) to first correct your federal return, then update California so Form 540NR-X is generated automatically.
Amend TurboTax CD/Download
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