I'm experiencing the same problem. I moved out of CA so I am filing 540NR as part-year resident. If I put my total taxable income from my 540NR line 19, it calculates that my son owes a ridiculous amount of taxes, because of course the tax that I owe is not based on my total taxable income but only my California taxable income (504NR line 35). And Turbotax will not let me complete the worksheet for parents filing 540NR. I can enter some fields but the auto-populated ones (all calculations based on my entries) remain blank.
If I enter only my California taxable income, it comes up with a more reasonable number but it is not correct and also not the correct way to complete this form.
