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"If box E in your RL1 already had tax deducted, you need to verify with your employer if that tax was in fact paid to Quebec. If yes, then you would be ineligible. "

 

In my case I work in ON and live in QC, and only part of the QC tax was paid through my employer. As a result I overpaid the federal tax and have to pay tax owing to QC. So yes there is amount entered in my RL1 (the amount that was paid to QC tax), but I should still be able to transfer the tax owed to QC if it respect following: 

You can transfer, to the province of Quebec, up to 45% of the income tax shown on Federal information slips …”. Why would TurboTax make it ineligible in this case? And why I am eligible to do this if I use "Forms" mode but not in "Easy mode"?