You don't need to enter the CA Middle Class Tax Rebate. Just ignore it.
IRS has ruled the California Middle Class Tax Refund is NOT taxable. So you don't have to enter it at all
https://www.irs.gov/newsroom/irs-issues-guidance-on-state-tax-payments-to-help-taxpayers
Or are you trying to receive it? You can't get it on your tax return. See this CA info
https://www.ftb.ca.gov/about-ftb/newsroom/middle-class-tax-refund/index.html
