Net capital loss carry forward done automatically to offset capital gain this year even I dont have to pay any tax, I enter 0 for the amount carried forward from net capital loss carry forward, it worked but override calculated field & cannot net file

The reason you are not able to Netfile as Schedule 3 is still locked by CRA and not finalized by yet. Please refer to this link Why does TurboTax say my forms are locked or haven't been finalized? 

We do not have any ETA on this yet but as soon a these forms gets finalize we will be updating them in TurboTax for an accurate calculations.

We appreciate your patience.

Thanks for choosing TurboTax.