I am in the same situation. I tried talking to two TurboTax support people and a Turbo Tax specialist yesterday for over an hour, but the best I got is "this is what TurboTax is calculating, so you have to file in person." Pretty frustrating experience as this form has been an issue for a few years now.
On our W2s, it looks like this as an example:
IL wages: 80,000
CA wages: 20,000 (supposed to be reported on column B of Schedule CR)
Federal wages: 80,000 (supposed to be reported on column A of Schedule CR)
I enter the exact numbers from the W2 and it results in this error in TurboTax. Yes, I know that 80 + 20 does not equal 80 but that's why I'm trying to fill this form out to get the credit.
